656103254561 has 4 divisors (see below), whose sum is σ = 660823422000. Its totient is φ = 651383087124.

The previous prime is 656103254551. The next prime is 656103254567. The reversal of 656103254561 is 165452301656.

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 656103254561 - 2²² = 656099060257 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (656103254567) 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, 2360083511 + ... + 2360083788.

It is an arithmetic number, because the mean of its divisors is an integer number (165205855500).

Almost surely, 2^656103254561 is an apocalyptic number.

It is an amenable number.

656103254561 is a deficient number, since it is larger than the sum of its proper divisors (4720167439).

656103254561 is a wasteful number, since it uses less digits than its factorization.

656103254561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4720167438.

The product of its (nonzero) digits is 648000, while the sum is 44.

The spelling of 656103254561 in words is "six hundred fifty-six billion, one hundred three million, two hundred fifty-four thousand, five hundred sixty-one".