51020113872 has 160 divisors (see below), whose sum is σ = 162750472192. Its totient is φ = 13411671552.

The previous prime is 51020113871. The next prime is 51020113901. The reversal of 51020113872 is 27831102015.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51020113871) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1321953 + ... + 1359999.

Almost surely, 2^51020113872 is an apocalyptic number.

51020113872 is a gapful number since it is divisible by the number (52) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51020113872, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (81375236096).

51020113872 is an abundant number, since it is smaller than the sum of its proper divisors (111730358320).

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

51020113872 is a wasteful number, since it uses less digits than its factorization.

51020113872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38385 (or 38379 counting only the distinct ones).

The product of its (nonzero) digits is 3360, while the sum is 30.

Adding to 51020113872 its reverse (27831102015), we get a palindrome (78851215887).

The spelling of 51020113872 in words is "fifty-one billion, twenty million, one hundred thirteen thousand, eight hundred seventy-two".