551979657 has 8 divisors (see below), whose sum is σ = 817747680. Its totient is φ = 367986420.

The previous prime is 551979643. The next prime is 551979671. The reversal of 551979657 is 756979155.

551979657 is a `hidden beast` number, since 5 + 519 + 79 + 6 + 57 = 666.

It is an interprime number because it is at equal distance from previous prime (551979643) and next prime (551979671).

It is not a de Polignac number, because 551979657 - 2⁴ = 551979641 is a prime.

It is not an unprimeable number, because it can be changed into a prime (551979607) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10221819 + ... + 10221872.

It is an arithmetic number, because the mean of its divisors is an integer number (102218460).

Almost surely, 2^551979657 is an apocalyptic number.

It is an amenable number.

551979657 is a deficient number, since it is larger than the sum of its proper divisors (265768023).

551979657 is a wasteful number, since it uses less digits than its factorization.

551979657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20443700 (or 20443694 counting only the distinct ones).

The product of its digits is 2976750, while the sum is 54.

The square root of 551979657 is about 23494.2473171626. The cubic root of 551979657 is about 820.3031087447.

The spelling of 551979657 in words is "five hundred fifty-one million, nine hundred seventy-nine thousand, six hundred fifty-seven".