51656343213511 has 8 divisors (see below), whose sum is σ = 53437700841120. Its totient is φ = 49874992546848.

The previous prime is 51656343213509. The next prime is 51656343213521. The reversal of 51656343213511 is 11531234365615.

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

It is a cyclic number.

It is not a de Polignac number, because 51656343213511 - 2¹ = 51656343213509 is a prime.

It is a super-2 number, since 2×51656343213511² (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 (51656343213521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16652350 + ... + 19509316.

It is an arithmetic number, because the mean of its divisors is an integer number (6679712605140).

Almost surely, 2^{51656343213511} is an apocalyptic number.

51656343213511 is a deficient number, since it is larger than the sum of its proper divisors (1781357627609).

51656343213511 is a wasteful number, since it uses less digits than its factorization.

51656343213511 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3480473.

The product of its digits is 972000, while the sum is 46.

The spelling of 51656343213511 in words is "fifty-one trillion, six hundred fifty-six billion, three hundred forty-three million, two hundred thirteen thousand, five hundred eleven".