656550000621 has 12 divisors (see below), whose sum is σ = 948510733248. Its totient is φ = 437625816264.

The previous prime is 656550000571. The next prime is 656550000643. The reversal of 656550000621 is 126000055656.

It is a happy number.

It is not a de Polignac number, because 656550000621 - 2²¹ = 656547903469 is a prime.

It is a super-3 number, since 3×656550000621³ (a number of 36 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (656550002621) 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, 6125935 + ... + 6232188.

It is an arithmetic number, because the mean of its divisors is an integer number (79042561104).

Almost surely, 2^656550000621 is an apocalyptic number.

It is an amenable number.

656550000621 is a deficient number, since it is larger than the sum of its proper divisors (291960732627).

656550000621 is a wasteful number, since it uses less digits than its factorization.

656550000621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12364032 (or 12364029 counting only the distinct ones).

The product of its (nonzero) digits is 54000, while the sum is 36.

The spelling of 656550000621 in words is "six hundred fifty-six billion, five hundred fifty million, six hundred twenty-one", and thus it is an aban number.