551665564 has 12 divisors (see below), whose sum is σ = 965908888. Its totient is φ = 275691600.

The previous prime is 551665547. The next prime is 551665577. The reversal of 551665564 is 465566155.

It is a self number, because there is not a number n which added to its sum of digits gives 551665564.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26247 + ... + 42334.

Almost surely, 2^551665564 is an apocalyptic number.

It is an amenable number.

551665564 is a deficient number, since it is larger than the sum of its proper divisors (414243324).

551665564 is a wasteful number, since it uses less digits than its factorization.

551665564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70596 (or 70594 counting only the distinct ones).

The product of its digits is 540000, while the sum is 43.

The square root of 551665564 is about 23487.5618998652. The cubic root of 551665564 is about 820.1474868560.

The spelling of 551665564 in words is "five hundred fifty-one million, six hundred sixty-five thousand, five hundred sixty-four".