51087994709472 has 216 divisors, whose sum is σ = 169024956596496. Its totient is φ = 14594493118464.

The previous prime is 51087994709471. The next prime is 51087994709473. The reversal of 51087994709472 is 27490749978015.

51087994709472 is a `hidden beast` number, since 5 + 1 + 0 + 87 + 9 + 9 + 4 + 70 + 9 + 472 = 666.

It is an interprime number because it is at equal distance from previous prime (51087994709471) and next prime (51087994709473).

It is a Harshad number since it is a multiple of its sum of digits (72).

It is a self number, because there is not a number n which added to its sum of digits gives 51087994709472.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51087994709471) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 100322248 + ... + 100830200.

It is an arithmetic number, because the mean of its divisors is an integer number (782522947206).

Almost surely, 2^{51087994709472} is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51087994709472, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (84512478298248).

51087994709472 is an abundant number, since it is smaller than the sum of its proper divisors (117936961887024).

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

51087994709472 is a wasteful number, since it uses less digits than its factorization.

51087994709472 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 515110 (or 515092 counting only the distinct ones).

The product of its (nonzero) digits is 320060160, while the sum is 72.

The spelling of 51087994709472 in words is "fifty-one trillion, eighty-seven billion, nine hundred ninety-four million, seven hundred nine thousand, four hundred seventy-two".