656526661 has 4 divisors (see below), whose sum is σ = 750316192. Its totient is φ = 562737132.

The previous prime is 656526593. The next prime is 656526677. The reversal of 656526661 is 166625656.

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 656526661 - 2⁹ = 656526149 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 (656526061) 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, 46894755 + ... + 46894768.

It is an arithmetic number, because the mean of its divisors is an integer number (187579048).

Almost surely, 2^656526661 is an apocalyptic number.

It is an amenable number.

656526661 is a deficient number, since it is larger than the sum of its proper divisors (93789531).

656526661 is an equidigital number, since it uses as much as digits as its factorization.

656526661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 93789530.

The product of its digits is 388800, while the sum is 43.

The square root of 656526661 is about 25622.7762157031. The cubic root of 656526661 is about 869.1287622880.

The spelling of 656526661 in words is "six hundred fifty-six million, five hundred twenty-six thousand, six hundred sixty-one".