669956655 has 32 divisors (see below), whose sum is σ = 1171611648. Its totient is φ = 325440000.

The previous prime is 669956633. The next prime is 669956657. The reversal of 669956655 is 556659966.

It is not a de Polignac number, because 669956655 - 2⁶ = 669956591 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 669956595 and 669956604.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (669956657) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 34471 + ... + 50280.

It is an arithmetic number, because the mean of its divisors is an integer number (36612864).

Almost surely, 2^669956655 is an apocalyptic number.

669956655 is a deficient number, since it is larger than the sum of its proper divisors (501654993).

669956655 is a wasteful number, since it uses less digits than its factorization.

669956655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84807.

The product of its digits is 13122000, while the sum is 57.

The square root of 669956655 is about 25883.5209158260. The cubic root of 669956655 is about 875.0151420509.

The spelling of 669956655 in words is "six hundred sixty-nine million, nine hundred fifty-six thousand, six hundred fifty-five".