51656515011 has 6 divisors (see below), whose sum is σ = 74614966140. Its totient is φ = 34437676668.

The previous prime is 51656515003. The next prime is 51656515081. The reversal of 51656515011 is 11051565615.

It is a happy number.

51656515011 is a `hidden beast` number, since 51 + 6 + 56 + 51 + 501 + 1 = 666.

It is not a de Polignac number, because 51656515011 - 2³ = 51656515003 is a prime.

It is not an unprimeable number, because it can be changed into a prime (51656515081) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2869806381 + ... + 2869806398.

It is an arithmetic number, because the mean of its divisors is an integer number (12435827690).

Almost surely, 2^51656515011 is an apocalyptic number.

51656515011 is a deficient number, since it is larger than the sum of its proper divisors (22958451129).

51656515011 is a wasteful number, since it uses less digits than its factorization.

51656515011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5739612785 (or 5739612782 counting only the distinct ones).

The product of its (nonzero) digits is 22500, while the sum is 36.

The spelling of 51656515011 in words is "fifty-one billion, six hundred fifty-six million, five hundred fifteen thousand, eleven".