51020155505 has 32 divisors (see below), whose sum is σ = 67331174400. Its totient is φ = 36806143680.

The previous prime is 51020155493. The next prime is 51020155583. The reversal of 51020155505 is 50555102015.

It is not a de Polignac number, because 51020155505 - 2¹⁶ = 51020089969 is a prime.

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, 3463646 + ... + 3478344.

It is an arithmetic number, because the mean of its divisors is an integer number (2104099200).

Almost surely, 2^51020155505 is an apocalyptic number.

51020155505 is a gapful number since it is divisible by the number (55) formed by its first and last digit.

It is an amenable number.

51020155505 is a deficient number, since it is larger than the sum of its proper divisors (16311018895).

51020155505 is a wasteful number, since it uses less digits than its factorization.

51020155505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15221.

The product of its (nonzero) digits is 6250, while the sum is 29.

The spelling of 51020155505 in words is "fifty-one billion, twenty million, one hundred fifty-five thousand, five hundred five".