551105206561 has 16 divisors (see below), whose sum is σ = 678779668224. Its totient is φ = 435720210624.

The previous prime is 551105206549. The next prime is 551105206669. The reversal of 551105206561 is 165602501155.

It is a cyclic number.

It is not a de Polignac number, because 551105206561 - 2³⁷ = 413666253089 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 551105206561.

It is not an unprimeable number, because it can be changed into a prime (551105206511) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2090710 + ... + 2339503.

It is an arithmetic number, because the mean of its divisors is an integer number (42423729264).

Almost surely, 2^551105206561 is an apocalyptic number.

It is an amenable number.

551105206561 is a deficient number, since it is larger than the sum of its proper divisors (127674461663).

551105206561 is a wasteful number, since it uses less digits than its factorization.

551105206561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4431600.

The product of its (nonzero) digits is 45000, while the sum is 37.

The spelling of 551105206561 in words is "five hundred fifty-one billion, one hundred five million, two hundred six thousand, five hundred sixty-one".