656725501 has 4 divisors (see below), whose sum is σ = 670698432. Its totient is φ = 642752572.

The previous prime is 656725477. The next prime is 656725523. The reversal of 656725501 is 105527656.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 656725501 - 2¹¹ = 656723453 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (656725591) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6986395 + ... + 6986488.

It is an arithmetic number, because the mean of its divisors is an integer number (167674608).

Almost surely, 2^656725501 is an apocalyptic number.

It is an amenable number.

656725501 is a deficient number, since it is larger than the sum of its proper divisors (13972931).

656725501 is a wasteful number, since it uses less digits than its factorization.

656725501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13972930.

The product of its (nonzero) digits is 63000, while the sum is 37.

The square root of 656725501 is about 25626.6560635601. The cubic root of 656725501 is about 869.2164967901.

The spelling of 656725501 in words is "six hundred fifty-six million, seven hundred twenty-five thousand, five hundred one".