551400121255 has 4 divisors (see below), whose sum is σ = 661680145512. Its totient is φ = 441120097000.

The previous prime is 551400121229. The next prime is 551400121273. The reversal of 551400121255 is 552121004155.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 551400121255 - 2¹³ = 551400113063 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 55140012121 + ... + 55140012130.

It is an arithmetic number, because the mean of its divisors is an integer number (165420036378).

Almost surely, 2^551400121255 is an apocalyptic number.

551400121255 is a deficient number, since it is larger than the sum of its proper divisors (110280024257).

551400121255 is a wasteful number, since it uses less digits than its factorization.

551400121255 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 110280024256.

The product of its (nonzero) digits is 10000, while the sum is 31.

The spelling of 551400121255 in words is "five hundred fifty-one billion, four hundred million, one hundred twenty-one thousand, two hundred fifty-five".