656612501 has 4 divisors (see below), whose sum is σ = 656680992. Its totient is φ = 656544012.

The previous prime is 656612449. The next prime is 656612503. The reversal of 656612501 is 105216656.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 656612501 - 2¹⁰ = 656611477 is a prime.

It is a super-2 number, since 2×656612501² = 862279952938950002, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (656612503) 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, 16955 + ... + 40008.

It is an arithmetic number, because the mean of its divisors is an integer number (164170248).

Almost surely, 2^656612501 is an apocalyptic number.

It is an amenable number.

656612501 is a deficient number, since it is larger than the sum of its proper divisors (68491).

656612501 is a wasteful number, since it uses less digits than its factorization.

656612501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68490.

The product of its (nonzero) digits is 10800, while the sum is 32.

The square root of 656612501 is about 25624.4512331484. The cubic root of 656612501 is about 869.1666397859.

The spelling of 656612501 in words is "six hundred fifty-six million, six hundred twelve thousand, five hundred one".