51554400205 has 32 divisors (see below), whose sum is σ = 77162376960. Its totient is φ = 32124625920.

The previous prime is 51554400197. The next prime is 51554400257. The reversal of 51554400205 is 50200445515.

It is not a de Polignac number, because 51554400205 - 2³ = 51554400197 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 958261 + ... + 1010629.

It is an arithmetic number, because the mean of its divisors is an integer number (2411324280).

Almost surely, 2^51554400205 is an apocalyptic number.

51554400205 is a gapful number since it is divisible by the number (55) formed by its first and last digit.

It is an amenable number.

51554400205 is a deficient number, since it is larger than the sum of its proper divisors (25607976755).

51554400205 is a wasteful number, since it uses less digits than its factorization.

51554400205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54949.

The product of its (nonzero) digits is 20000, while the sum is 31.

The spelling of 51554400205 in words is "fifty-one billion, five hundred fifty-four million, four hundred thousand, two hundred five".