669402657 has 32 divisors (see below), whose sum is σ = 1236418560. Its totient is φ = 347740560.

The previous prime is 669402647. The next prime is 669402677. The reversal of 669402657 is 756204966.

It is not a de Polignac number, because 669402657 - 2¹⁶ = 669337121 is a prime.

It is not an unprimeable number, because it can be changed into a prime (669402637) 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, 158913 + ... + 163070.

It is an arithmetic number, because the mean of its divisors is an integer number (38638080).

Almost surely, 2^669402657 is an apocalyptic number.

It is an amenable number.

669402657 is a deficient number, since it is larger than the sum of its proper divisors (567015903).

669402657 is a wasteful number, since it uses less digits than its factorization.

669402657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 322010 (or 322004 counting only the distinct ones).

The product of its (nonzero) digits is 544320, while the sum is 45.

The square root of 669402657 is about 25872.8169513874. The cubic root of 669402657 is about 874.7738874791.

The spelling of 669402657 in words is "six hundred sixty-nine million, four hundred two thousand, six hundred fifty-seven".