551205309977 has 32 divisors (see below), whose sum is σ = 647824945152. Its totient is φ = 459170135424.

The previous prime is 551205309959. The next prime is 551205310013. The reversal of 551205309977 is 779903502155.

It is not a de Polignac number, because 551205309977 - 2²⁰ = 551204261401 is a prime.

It is not an unprimeable number, because it can be changed into a prime (551205309947) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 55298048 + ... + 55308014.

It is an arithmetic number, because the mean of its divisors is an integer number (20244529536).

Almost surely, 2^551205309977 is an apocalyptic number.

It is an amenable number.

551205309977 is a deficient number, since it is larger than the sum of its proper divisors (96619635175).

551205309977 is a wasteful number, since it uses less digits than its factorization.

551205309977 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10917.

The product of its (nonzero) digits is 2976750, while the sum is 53.

The spelling of 551205309977 in words is "five hundred fifty-one billion, two hundred five million, three hundred nine thousand, nine hundred seventy-seven".