551491890625 has 63 divisors (see below), whose sum is σ = 748099428111. Its totient is φ = 406364400000.

The previous prime is 551491890613. The next prime is 551491890629. The reversal of 551491890625 is 526098194155.

The square root of 551491890625 is 742625.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 31 ways, for example, as 75137936769 + 476353953856 = 274113^2 + 690184^2 .

It is not a de Polignac number, because 551491890625 - 2³⁷ = 414052937153 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (551491890629) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 62 ways as a sum of consecutive naturals, for example, 1206765397 + ... + 1206765853.

It is an arithmetic number, because the mean of its divisors is an integer number (11874594097).

Almost surely, 2^551491890625 is an apocalyptic number.

551491890625 is the 742625-th square number.

551491890625 is the 371313-rd centered octagonal number.

It is an amenable number.

551491890625 is a deficient number, since it is larger than the sum of its proper divisors (196607537486).

551491890625 is an frugal number, since it uses more digits than its factorization.

551491890625 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 970 (or 475 counting only the distinct ones).

The product of its (nonzero) digits is 3888000, while the sum is 55.

The spelling of 551491890625 in words is "five hundred fifty-one billion, four hundred ninety-one million, eight hundred ninety thousand, six hundred twenty-five".