51551515224 has 384 divisors, whose sum is σ = 172253952000. Its totient is φ = 13734604800.

The previous prime is 51551515199. The next prime is 51551515231. The reversal of 51551515224 is 42251515515.

51551515224 is a `hidden beast` number, since 5 + 1 + 551 + 51 + 52 + 2 + 4 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 12102007 + ... + 12106265.

It is an arithmetic number, because the mean of its divisors is an integer number (448578000).

Almost surely, 2^51551515224 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 51551515224, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (86126976000).

51551515224 is an abundant number, since it is smaller than the sum of its proper divisors (120702436776).

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

51551515224 is a wasteful number, since it uses less digits than its factorization.

51551515224 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4359 (or 4352 counting only the distinct ones).

The product of its digits is 50000, while the sum is 36.

The spelling of 51551515224 in words is "fifty-one billion, five hundred fifty-one million, five hundred fifteen thousand, two hundred twenty-four".