51220631055 has 32 divisors (see below), whose sum is σ = 89437996800. Its totient is φ = 24824602880.

The previous prime is 51220631041. The next prime is 51220631141. The reversal of 51220631055 is 55013602215.

It is a happy number.

It is not a de Polignac number, because 51220631055 - 2⁴ = 51220631039 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 (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 375496 + ... + 493394.

It is an arithmetic number, because the mean of its divisors is an integer number (2794937400).

Almost surely, 2^51220631055 is an apocalyptic number.

51220631055 is a gapful number since it is divisible by the number (55) formed by its first and last digit.

51220631055 is a deficient number, since it is larger than the sum of its proper divisors (38217365745).

51220631055 is a wasteful number, since it uses less digits than its factorization.

51220631055 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 120551.

The product of its (nonzero) digits is 9000, while the sum is 30.

The spelling of 51220631055 in words is "fifty-one billion, two hundred twenty million, six hundred thirty-one thousand, fifty-five".