551646957621 has 16 divisors (see below), whose sum is σ = 764509765824. Its totient is φ = 353513902464.

The previous prime is 551646957611. The next prime is 551646957661. The reversal of 551646957621 is 126759646155.

It is not a de Polignac number, because 551646957621 - 2²² = 551642763317 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (551646957611) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 29929296 + ... + 29947721.

It is an arithmetic number, because the mean of its divisors is an integer number (47781860364).

Almost surely, 2^551646957621 is an apocalyptic number.

It is an amenable number.

551646957621 is a deficient number, since it is larger than the sum of its proper divisors (212862808203).

551646957621 is a wasteful number, since it uses less digits than its factorization.

551646957621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59877140.

The product of its digits is 13608000, while the sum is 57.

The spelling of 551646957621 in words is "five hundred fifty-one billion, six hundred forty-six million, nine hundred fifty-seven thousand, six hundred twenty-one".