51121241664 has 56 divisors (see below), whose sum is σ = 135280651968. Its totient is φ = 17037596160.

The previous prime is 51121241659. The next prime is 51121241701. The reversal of 51121241664 is 46614212115.

It is a super-2 number, since 2×51121241664² (a number of 22 digits) contains 22 as substring.

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, 1371109 + ... + 1407899.

It is an arithmetic number, because the mean of its divisors is an integer number (2415725928).

Almost surely, 2^51121241664 is an apocalyptic number.

It is an amenable number.

51121241664 is an abundant number, since it is smaller than the sum of its proper divisors (84159410304).

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

51121241664 is a wasteful number, since it uses less digits than its factorization.

51121241664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44043 (or 44033 counting only the distinct ones).

The product of its digits is 11520, while the sum is 33.

Adding to 51121241664 its reverse (46614212115), we get a palindrome (97735453779).

The spelling of 51121241664 in words is "fifty-one billion, one hundred twenty-one million, two hundred forty-one thousand, six hundred sixty-four".