255639465 has 12 divisors (see below), whose sum is σ = 443108484. Its totient is φ = 136341024.

The previous prime is 255639463. The next prime is 255639467. The reversal of 255639465 is 564936552.

255639465 is a `hidden beast` number, since 2 + 5 + 5 + 639 + 4 + 6 + 5 = 666.

It is an interprime number because it is at equal distance from previous prime (255639463) and next prime (255639467).

It can be written as a sum of positive squares in 2 ways, for example, as 129481641 + 126157824 = 11379^2 + 11232^2 .

It is not a de Polignac number, because 255639465 - 2¹ = 255639463 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45), and also a Moran number because the ratio is a prime number: 5680877 = 255639465 / (2 + 5 + 5 + 6 + 3 + 9 + 4 + 6 + 5).

It is a self number, because there is not a number n which added to its sum of digits gives 255639465.

It is not an unprimeable number, because it can be changed into a prime (255639463) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2840394 + ... + 2840483.

It is an arithmetic number, because the mean of its divisors is an integer number (36925707).

Almost surely, 2^255639465 is an apocalyptic number.

It is an amenable number.

255639465 is a deficient number, since it is larger than the sum of its proper divisors (187469019).

255639465 is a wasteful number, since it uses less digits than its factorization.

255639465 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5680888 (or 5680885 counting only the distinct ones).

The product of its digits is 972000, while the sum is 45.

The square root of 255639465 is about 15988.7293116120. The cubic root of 255639465 is about 634.6622007251.

The spelling of 255639465 in words is "two hundred fifty-five million, six hundred thirty-nine thousand, four hundred sixty-five".