656016454657 has 4 divisors (see below), whose sum is σ = 656040174660. Its totient is φ = 655992734656.

The previous prime is 656016454619. The next prime is 656016454693. The reversal of 656016454657 is 756454610656.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 410254341121 + 245762113536 = 640511^2 + 495744^2 .

It is a cyclic number.

It is not a de Polignac number, because 656016454657 - 2¹⁵ = 656016421889 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 656016454598 and 656016454607.

It is not an unprimeable number, because it can be changed into a prime (656016454607) 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, 11818468 + ... + 11873845.

It is an arithmetic number, because the mean of its divisors is an integer number (164010043665).

Almost surely, 2^656016454657 is an apocalyptic number.

It is an amenable number.

656016454657 is a deficient number, since it is larger than the sum of its proper divisors (23720003).

656016454657 is a wasteful number, since it uses less digits than its factorization.

656016454657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23720002.

The product of its (nonzero) digits is 18144000, while the sum is 55.

The spelling of 656016454657 in words is "six hundred fifty-six billion, sixteen million, four hundred fifty-four thousand, six hundred fifty-seven".