51021755137 has 8 divisors (see below), whose sum is σ = 51064689312. Its totient is φ = 50978844000.

The previous prime is 51021755093. The next prime is 51021755159. The reversal of 51021755137 is 73155712015.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51021755137 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 51021755096 and 51021755105.

It is not an unprimeable number, because it can be changed into a prime (51021755167) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11218698 + ... + 11223244.

It is an arithmetic number, because the mean of its divisors is an integer number (6383086164).

Almost surely, 2^51021755137 is an apocalyptic number.

It is an amenable number.

51021755137 is a deficient number, since it is larger than the sum of its proper divisors (42934175).

51021755137 is a wasteful number, since it uses less digits than its factorization.

51021755137 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11519.

The product of its (nonzero) digits is 36750, while the sum is 37.

The spelling of 51021755137 in words is "fifty-one billion, twenty-one million, seven hundred fifty-five thousand, one hundred thirty-seven".