2551232321557 has 2 divisors, whose sum is σ = 2551232321558. Its totient is φ = 2551232321556.

The previous prime is 2551232321543. The next prime is 2551232321609. The reversal of 2551232321557 is 7551232321552.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1805083609156 + 746148712401 = 1343534^2 + 863799^2 .

It is a cyclic number.

It is not a de Polignac number, because 2551232321557 - 2³⁵ = 2516872583189 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2551232321507) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1275616160778 + 1275616160779.

It is an arithmetic number, because the mean of its divisors is an integer number (1275616160779).

Almost surely, 2^{2551232321557} is an apocalyptic number.

It is an amenable number.

2551232321557 is a deficient number, since it is larger than the sum of its proper divisors (1).

2551232321557 is an equidigital number, since it uses as much as digits as its factorization.

2551232321557 is an evil number, because the sum of its binary digits is even.

The product of its digits is 630000, while the sum is 43.

The spelling of 2551232321557 in words is "two trillion, five hundred fifty-one billion, two hundred thirty-two million, three hundred twenty-one thousand, five hundred fifty-seven".