51121522542 has 32 divisors (see below), whose sum is σ = 102869568000. Its totient is φ = 16936190208.

The previous prime is 51121522513. The next prime is 51121522547. The reversal of 51121522542 is 24522512115.

It is a super-2 number, since 2×51121522542² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51121522547) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2154459 + ... + 2178057.

It is an arithmetic number, because the mean of its divisors is an integer number (3214674000).

Almost surely, 2^51121522542 is an apocalyptic number.

51121522542 is an abundant number, since it is smaller than the sum of its proper divisors (51748045458).

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

51121522542 is a wasteful number, since it uses less digits than its factorization.

51121522542 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25800.

The product of its digits is 8000, while the sum is 30.

The spelling of 51121522542 in words is "fifty-one billion, one hundred twenty-one million, five hundred twenty-two thousand, five hundred forty-two".