51000505555 has 32 divisors (see below), whose sum is σ = 64458903168. Its totient is φ = 38663116800.

The previous prime is 51000505553. The next prime is 51000505639. The reversal of 51000505555 is 55550500015.

It is not a de Polignac number, because 51000505555 - 2¹ = 51000505553 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51000505553) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5455185 + ... + 5464525.

It is an arithmetic number, because the mean of its divisors is an integer number (2014340724).

Almost surely, 2^51000505555 is an apocalyptic number.

51000505555 is a deficient number, since it is larger than the sum of its proper divisors (13458397613).

51000505555 is a wasteful number, since it uses less digits than its factorization.

51000505555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9807.

The product of its (nonzero) digits is 15625, while the sum is 31.

The spelling of 51000505555 in words is "fifty-one billion, five hundred five thousand, five hundred fifty-five".