647165385 has 12 divisors (see below), whose sum is σ = 1121753412. Its totient is φ = 345154848.

The previous prime is 647165357. The next prime is 647165399. The reversal of 647165385 is 583561746.

It can be written as a sum of positive squares in 2 ways, for example, as 461906064 + 185259321 = 21492^2 + 13611^2 .

It is not a de Polignac number, because 647165385 - 2⁵ = 647165353 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: 14381453 = 647165385 / (6 + 4 + 7 + 1 + 6 + 5 + 3 + 8 + 5).

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 647165385.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7190682 + ... + 7190771.

It is an arithmetic number, because the mean of its divisors is an integer number (93479451).

Almost surely, 2^647165385 is an apocalyptic number.

It is an amenable number.

647165385 is a deficient number, since it is larger than the sum of its proper divisors (474588027).

647165385 is a wasteful number, since it uses less digits than its factorization.

647165385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14381464 (or 14381461 counting only the distinct ones).

The product of its digits is 604800, while the sum is 45.

The square root of 647165385 is about 25439.4454538616. The cubic root of 647165385 is about 864.9780630832.

The spelling of 647165385 in words is "six hundred forty-seven million, one hundred sixty-five thousand, three hundred eighty-five".