51870438615942 has 80 divisors (see below), whose sum is σ = 123087811956912. Its totient is φ = 16270083256320.

The previous prime is 51870438615871. The next prime is 51870438615973. The reversal of 51870438615942 is 24951683407815.

It is a happy number.

51870438615942 is a `hidden beast` number, since 5 + 1 + 8 + 7 + 0 + 4 + 3 + 8 + 615 + 9 + 4 + 2 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 51870438615942.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 13253713 + ... + 16715315.

It is a 1-persistent number, because it is pandigital, but 2⋅51870438615942 = 103740877231884 is not.

Almost surely, 2^{51870438615942} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51870438615942, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (61543905978456).

51870438615942 is an abundant number, since it is smaller than the sum of its proper divisors (71217373340970).

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

51870438615942 is a wasteful number, since it uses less digits than its factorization.

51870438615942 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3467075 (or 3467066 counting only the distinct ones).

The product of its (nonzero) digits is 58060800, while the sum is 63.

The spelling of 51870438615942 in words is "fifty-one trillion, eight hundred seventy billion, four hundred thirty-eight million, six hundred fifteen thousand, nine hundred forty-two".