51681621126 has 16 divisors (see below), whose sum is σ = 103523007744. Its totient is φ = 17200579464.

The previous prime is 51681621109. The next prime is 51681621133. The reversal of 51681621126 is 62112618615.

It is a super-2 number, since 2×51681621126² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6652690 + ... + 6660453.

It is an arithmetic number, because the mean of its divisors is an integer number (6470187984).

Almost surely, 2^51681621126 is an apocalyptic number.

51681621126 is an abundant number, since it is smaller than the sum of its proper divisors (51841386618).

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

51681621126 is a wasteful number, since it uses less digits than its factorization.

51681621126 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13313795.

The product of its digits is 34560, while the sum is 39.

The spelling of 51681621126 in words is "fifty-one billion, six hundred eighty-one million, six hundred twenty-one thousand, one hundred twenty-six".