656545456565454 has 16 divisors (see below), whose sum is σ = 1313439305564880. Its totient is φ = 218790420116160.

The previous prime is 656545456565441. The next prime is 656545456565477. The reversal of 656545456565454 is 454565654545656.

It is a happy number.

656545456565454 is an esthetic number in base 10, because in such base its adjacent digits differ by 1.

It is a super-2 number, since 2×656545456565454² (a number of 30 digits) contains 22 as substring.

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

It is a congruent number.

It is an unprimeable number.

It is an upside-down number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14516326917 + ... + 14516372144.

It is an arithmetic number, because the mean of its divisors is an integer number (82089956597805).

Almost surely, 2^{656545456565454} is an apocalyptic number.

656545456565454 is an abundant number, since it is smaller than the sum of its proper divisors (656893848999426).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

656545456565454 is a wasteful number, since it uses less digits than its factorization.

656545456565454 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29032702835.

The product of its digits is 25920000000, while the sum is 75.

The spelling of 656545456565454 in words is "six hundred fifty-six trillion, five hundred forty-five billion, four hundred fifty-six million, five hundred sixty-five thousand, four hundred fifty-four".