51180172920 has 256 divisors, whose sum is σ = 179432755200. Its totient is φ = 12958133760.

The previous prime is 51180172913. The next prime is 51180172943. The reversal of 51180172920 is 2927108115.

It is a happy number.

It is a super-2 number, since 2×51180172920² (a number of 22 digits) contains 22 as substring.

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 63 ways as a sum of consecutive naturals, for example, 1760019 + ... + 1788861.

It is an arithmetic number, because the mean of its divisors is an integer number (700909200).

Almost surely, 2^51180172920 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 51180172920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (89716377600).

51180172920 is an abundant number, since it is smaller than the sum of its proper divisors (128252582280).

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

51180172920 is a wasteful number, since it uses less digits than its factorization.

51180172920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28947 (or 28937 counting only the distinct ones).

The product of its (nonzero) digits is 10080, while the sum is 36.

The spelling of 51180172920 in words is "fifty-one billion, one hundred eighty million, one hundred seventy-two thousand, nine hundred twenty".