551355455021 has 16 divisors (see below), whose sum is σ = 663723970560. Its totient is φ = 447420743280.

The previous prime is 551355455003. The next prime is 551355455023. The reversal of 551355455021 is 120554553155.

It is not a de Polignac number, because 551355455021 - 2¹⁰ = 551355453997 is a prime.

It is a super-2 number, since 2×551355455021² (a number of 24 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 551355455021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (551355455023) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1170821 + ... + 1572746.

It is an arithmetic number, because the mean of its divisors is an integer number (41482748160).

Almost surely, 2^551355455021 is an apocalyptic number.

It is an amenable number.

551355455021 is a deficient number, since it is larger than the sum of its proper divisors (112368515539).

551355455021 is a wasteful number, since it uses less digits than its factorization.

551355455021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2745104.

The product of its (nonzero) digits is 375000, while the sum is 41.

The spelling of 551355455021 in words is "five hundred fifty-one billion, three hundred fifty-five million, four hundred fifty-five thousand, twenty-one".