51011515655 has 16 divisors (see below), whose sum is σ = 64922433984. Its totient is φ = 38394977280.

The previous prime is 51011515651. The next prime is 51011515661. The reversal of 51011515655 is 55651511015.

51011515655 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 51011515655 - 2² = 51011515651 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51011515651) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3628874 + ... + 3642903.

It is an arithmetic number, because the mean of its divisors is an integer number (4057652124).

Almost surely, 2^51011515655 is an apocalyptic number.

51011515655 is a deficient number, since it is larger than the sum of its proper divisors (13910918329).

51011515655 is a wasteful number, since it uses less digits than its factorization.

51011515655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7271866.

The product of its (nonzero) digits is 18750, while the sum is 35.

The spelling of 51011515655 in words is "fifty-one billion, eleven million, five hundred fifteen thousand, six hundred fifty-five".