51656506155511 has 8 divisors (see below), whose sum is σ = 54488787955200. Its totient is φ = 48835576187640.

The previous prime is 51656506155427. The next prime is 51656506155571. The reversal of 51656506155511 is 11555160565615.

It is a happy number.

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

It is not a de Polignac number, because 51656506155511 - 2¹¹ = 51656506153463 is a prime.

It is a super-2 number, since 2×51656506155511² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51656506155571) 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, 2837948605 + ... + 2837966806.

It is an arithmetic number, because the mean of its divisors is an integer number (6811098494400).

Almost surely, 2^{51656506155511} is an apocalyptic number.

51656506155511 is a deficient number, since it is larger than the sum of its proper divisors (2832281799689).

51656506155511 is a wasteful number, since it uses less digits than its factorization.

51656506155511 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5675915909.

The product of its (nonzero) digits is 3375000, while the sum is 52.

The spelling of 51656506155511 in words is "fifty-one trillion, six hundred fifty-six billion, five hundred six million, one hundred fifty-five thousand, five hundred eleven".