51115893729 has 32 divisors (see below), whose sum is σ = 70928234496. Its totient is φ = 32722008000.

The previous prime is 51115893721. The next prime is 51115893761. The reversal of 51115893729 is 92739851115.

It is not a de Polignac number, because 51115893729 - 2³ = 51115893721 is a prime.

It is a super-2 number, since 2×51115893729² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (51115893721) 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, 2360419 + ... + 2381975.

It is an arithmetic number, because the mean of its divisors is an integer number (2216507328).

Almost surely, 2^51115893729 is an apocalyptic number.

It is an amenable number.

51115893729 is a deficient number, since it is larger than the sum of its proper divisors (19812340767).

51115893729 is a wasteful number, since it uses less digits than its factorization.

51115893729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21925.

The product of its digits is 680400, while the sum is 51.

The spelling of 51115893729 in words is "fifty-one billion, one hundred fifteen million, eight hundred ninety-three thousand, seven hundred twenty-nine".