51465618 has 40 divisors (see below), whose sum is σ = 115847820. Its totient is φ = 17076960.

The previous prime is 51465599. The next prime is 51465649. The reversal of 51465618 is 81656415.

51465618 is a `hidden beast` number, since 51 + 46 + 561 + 8 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 51451929 + 13689 = 7173^2 + 117^2 .

It is a super-2 number, since 2×51465618² = 5297419672243848, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 42988 + ... + 44168.

Almost surely, 2^51465618 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51465618, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (57923910).

51465618 is an abundant number, since it is smaller than the sum of its proper divisors (64382202).

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

51465618 is a wasteful number, since it uses less digits than its factorization.

51465618 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1464 (or 1455 counting only the distinct ones).

The product of its digits is 28800, while the sum is 36.

The square root of 51465618 is about 7173.9541398032. The cubic root of 51465618 is about 371.9681294236.

The spelling of 51465618 in words is "fifty-one million, four hundred sixty-five thousand, six hundred eighteen".