51665016555613 has 4 divisors (see below), whose sum is σ = 51678199773760. Its totient is φ = 51651833337468.

The previous prime is 51665016555611. The next prime is 51665016555679. The reversal of 51665016555613 is 31655561056615.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 51665016555613 - 2¹ = 51665016555611 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 (51665016555611) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6591603195 + ... + 6591611032.

It is an arithmetic number, because the mean of its divisors is an integer number (12919549943440).

Almost surely, 2^{51665016555613} is an apocalyptic number.

It is an amenable number.

51665016555613 is a deficient number, since it is larger than the sum of its proper divisors (13183218147).

51665016555613 is a wasteful number, since it uses less digits than its factorization.

51665016555613 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13183218146.

The product of its (nonzero) digits is 12150000, while the sum is 55.

The spelling of 51665016555613 in words is "fifty-one trillion, six hundred sixty-five billion, sixteen million, five hundred fifty-five thousand, six hundred thirteen".