51121802977 has 32 divisors (see below), whose sum is σ = 63542679552. Its totient is φ = 40127802624.

The previous prime is 51121802951. The next prime is 51121802981. The reversal of 51121802977 is 77920812115.

It is a de Polignac number, because none of the positive numbers 2^k-51121802977 is a prime.

It is a super-2 number, since 2×51121802977² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (43).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51121802917) 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, 1326778 + ... + 1364764.

It is an arithmetic number, because the mean of its divisors is an integer number (1985708736).

Almost surely, 2^51121802977 is an apocalyptic number.

It is an amenable number.

51121802977 is a deficient number, since it is larger than the sum of its proper divisors (12420876575).

51121802977 is a wasteful number, since it uses less digits than its factorization.

51121802977 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38317.

The product of its (nonzero) digits is 70560, while the sum is 43.

The spelling of 51121802977 in words is "fifty-one billion, one hundred twenty-one million, eight hundred two thousand, nine hundred seventy-seven".