551165566 has 32 divisors (see below), whose sum is σ = 1004290560. Its totient is φ = 221597856.

The previous prime is 551165557. The next prime is 551165591. The reversal of 551165566 is 665561155.

It is a super-2 number, since 2×551165566² = 607566962288200712, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17340 + ... + 37456.

It is an arithmetic number, because the mean of its divisors is an integer number (31384080).

Almost surely, 2^551165566 is an apocalyptic number.

551165566 is a deficient number, since it is larger than the sum of its proper divisors (453124994).

551165566 is a wasteful number, since it uses less digits than its factorization.

551165566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20248.

The product of its digits is 135000, while the sum is 40.

The square root of 551165566 is about 23476.9155980934. The cubic root of 551165566 is about 819.8996337599.

The spelling of 551165566 in words is "five hundred fifty-one million, one hundred sixty-five thousand, five hundred sixty-six".