669731755 has 24 divisors (see below), whose sum is σ = 1019885040. Its totient is φ = 417493440.

The previous prime is 669731737. The next prime is 669731789. The reversal of 669731755 is 557137966.

It is not a de Polignac number, because 669731755 - 2¹³ = 669723563 is a prime.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (49).

It is a junction number, because it is equal to n+sod(n) for n = 669731699 and 669731708.

It is an unprimeable number.

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 23 ways as a sum of consecutive naturals, for example, 121560 + ... + 126949.

It is an arithmetic number, because the mean of its divisors is an integer number (42495210).

Almost surely, 2^669731755 is an apocalyptic number.

669731755 is a deficient number, since it is larger than the sum of its proper divisors (350153285).

669731755 is a wasteful number, since it uses less digits than its factorization.

669731755 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 248539 (or 248532 counting only the distinct ones).

The product of its digits is 1190700, while the sum is 49.

The square root of 669731755 is about 25879.1760881215. The cubic root of 669731755 is about 874.9172188352.

The spelling of 669731755 in words is "six hundred sixty-nine million, seven hundred thirty-one thousand, seven hundred fifty-five".