669725755 has 16 divisors (see below), whose sum is σ = 828727200. Its totient is φ = 519321088.

The previous prime is 669725743. The next prime is 669725773. The reversal of 669725755 is 557527966.

It is a cyclic number.

It is not a de Polignac number, because 669725755 - 2⁵ = 669725723 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6771 + ... + 37219.

It is an arithmetic number, because the mean of its divisors is an integer number (51795450).

Almost surely, 2^669725755 is an apocalyptic number.

669725755 is a deficient number, since it is larger than the sum of its proper divisors (159001445).

669725755 is a wasteful number, since it uses less digits than its factorization.

669725755 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30590.

The product of its digits is 3969000, while the sum is 52.

The square root of 669725755 is about 25879.0601645423. The cubic root of 669725755 is about 874.9146060882.

It can be divided in two parts, 66972 and 5755, that added together give a palindrome (72727).

The spelling of 669725755 in words is "six hundred sixty-nine million, seven hundred twenty-five thousand, seven hundred fifty-five".