51885233640 has 112 divisors (see below), whose sum is σ = 175032692100. Its totient is φ = 13836054528.

The previous prime is 51885233633. The next prime is 51885233689. The reversal of 51885233640 is 4633258815.

51885233640 is a `hidden beast` number, since 5 + 1 + 88 + 523 + 3 + 6 + 40 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 51855487524 + 29746116 = 227718^2 + 5454^2 .

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 860505 + ... + 918824.

Almost surely, 2^51885233640 is an apocalyptic number.

It is an amenable number.

51885233640 is an abundant number, since it is smaller than the sum of its proper divisors (123147458460).

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

51885233640 is a wasteful number, since it uses less digits than its factorization.

51885233640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1779358 (or 1779339 counting only the distinct ones).

The product of its (nonzero) digits is 691200, while the sum is 45.

The spelling of 51885233640 in words is "fifty-one billion, eight hundred eighty-five million, two hundred thirty-three thousand, six hundred forty".