656669601 has 12 divisors (see below), whose sum is σ = 1084026112. Its totient is φ = 375239736.

The previous prime is 656669597. The next prime is 656669603. The reversal of 656669601 is 106966656.

It is not a de Polignac number, because 656669601 - 2² = 656669597 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (656669603) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5211601 + ... + 5211726.

Almost surely, 2^656669601 is an apocalyptic number.

It is an amenable number.

656669601 is a deficient number, since it is larger than the sum of its proper divisors (427356511).

656669601 is a wasteful number, since it uses less digits than its factorization.

656669601 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10423340 (or 10423337 counting only the distinct ones).

The product of its (nonzero) digits is 349920, while the sum is 45.

The square root of 656669601 is about 25625.5653791287. The cubic root of 656669601 is about 869.1918337303.

It can be divided in two parts, 6566 and 69601, that added together give a palindrome (76167).

The spelling of 656669601 in words is "six hundred fifty-six million, six hundred sixty-nine thousand, six hundred one".