51240564155065 has 16 divisors (see below), whose sum is σ = 65234568222720. Its totient is φ = 38529166838400.

The previous prime is 51240564155057. The next prime is 51240564155093. The reversal of 51240564155065 is 56055146504215.

It is not a de Polignac number, because 51240564155065 - 2³ = 51240564155057 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2123509036 + ... + 2123533165.

It is an arithmetic number, because the mean of its divisors is an integer number (4077160513920).

Almost surely, 2^{51240564155065} is an apocalyptic number.

It is an amenable number.

51240564155065 is a deficient number, since it is larger than the sum of its proper divisors (13994004067655).

51240564155065 is a wasteful number, since it uses less digits than its factorization.

51240564155065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4247042352.

The product of its (nonzero) digits is 3600000, while the sum is 49.

The spelling of 51240564155065 in words is "fifty-one trillion, two hundred forty billion, five hundred sixty-four million, one hundred fifty-five thousand, sixty-five".