51011506501 has 24 divisors (see below), whose sum is σ = 56626116120. Its totient is φ = 45790457856.

The previous prime is 51011506453. The next prime is 51011506537. The reversal of 51011506501 is 10560511015.

It can be written as a sum of positive squares in 4 ways, for example, as 6528478401 + 44483028100 = 80799^2 + 210910^2 .

It is not a de Polignac number, because 51011506501 - 2⁷ = 51011506373 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51011506591) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3166495 + ... + 3182563.

It is an arithmetic number, because the mean of its divisors is an integer number (2359421505).

Almost surely, 2^51011506501 is an apocalyptic number.

It is an amenable number.

51011506501 is a deficient number, since it is larger than the sum of its proper divisors (5614609619).

51011506501 is a wasteful number, since it uses less digits than its factorization.

51011506501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16485 (or 16462 counting only the distinct ones).

The product of its (nonzero) digits is 750, while the sum is 25.

The spelling of 51011506501 in words is "fifty-one billion, eleven million, five hundred six thousand, five hundred one".