51516312666 has 32 divisors (see below), whose sum is σ = 126809386368. Its totient is φ = 13586719680.

The previous prime is 51516312641. The next prime is 51516312667. The reversal of 51516312666 is 66621361515.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is not an unprimeable number, because it can be changed into a prime (51516312667) 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, 47175565 + ... + 47176656.

It is an arithmetic number, because the mean of its divisors is an integer number (3962793324).

Almost surely, 2^51516312666 is an apocalyptic number.

51516312666 is an abundant number, since it is smaller than the sum of its proper divisors (75293073702).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

51516312666 is a wasteful number, since it uses less digits than its factorization.

51516312666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 94352246.

The product of its digits is 194400, while the sum is 42.

The spelling of 51516312666 in words is "fifty-one billion, five hundred sixteen million, three hundred twelve thousand, six hundred sixty-six".