656436412645 has 8 divisors (see below), whose sum is σ = 848317825656. Its totient is φ = 484753043136.

The previous prime is 656436412631. The next prime is 656436412703. The reversal of 656436412645 is 546214634656.

It can be written as a sum of positive squares in 4 ways, for example, as 12401272321 + 644035140324 = 111361^2 + 802518^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 656436412645 - 2⁵ = 656436412613 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 656436412592 and 656436412601.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5049510802 + ... + 5049510931.

It is an arithmetic number, because the mean of its divisors is an integer number (106039728207).

Almost surely, 2^656436412645 is an apocalyptic number.

656436412645 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

It is an amenable number.

656436412645 is a deficient number, since it is larger than the sum of its proper divisors (191881413011).

656436412645 is a wasteful number, since it uses less digits than its factorization.

656436412645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10099021751.

The product of its digits is 12441600, while the sum is 52.

The spelling of 656436412645 in words is "six hundred fifty-six billion, four hundred thirty-six million, four hundred twelve thousand, six hundred forty-five".