656551140561 has 12 divisors (see below), whose sum is σ = 948431582592. Its totient is φ = 437663867256.

The previous prime is 656551140493. The next prime is 656551140563. The reversal of 656551140561 is 165041155656.

656551140561 is a `hidden beast` number, since 6 + 5 + 6 + 551 + 1 + 40 + 56 + 1 = 666.

It is not a de Polignac number, because 656551140561 - 2⁷ = 656551140433 is a prime.

It is not an unprimeable number, because it can be changed into a prime (656551140563) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2961501 + ... + 3175466.

It is an arithmetic number, because the mean of its divisors is an integer number (79035965216).

Almost surely, 2^656551140561 is an apocalyptic number.

It is an amenable number.

656551140561 is a deficient number, since it is larger than the sum of its proper divisors (291880442031).

656551140561 is a wasteful number, since it uses less digits than its factorization.

656551140561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6148860 (or 6148857 counting only the distinct ones).

The product of its (nonzero) digits is 540000, while the sum is 45.

The spelling of 656551140561 in words is "six hundred fifty-six billion, five hundred fifty-one million, one hundred forty thousand, five hundred sixty-one".