51515665155505 has 8 divisors (see below), whose sum is σ = 61941698384832. Its totient is φ = 41130598658928.

The previous prime is 51515665155491. The next prime is 51515665155527. The reversal of 51515665155505 is 50555156651515.

51515665155505 is digitally balanced in base 6, because in such base it contains all the possibile digits an equal number of times.

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 51515665155505 - 2⁵ = 51515665155473 is a prime.

It is a super-2 number, since 2×51515665155505² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10241680419 + ... + 10241685448.

It is an arithmetic number, because the mean of its divisors is an integer number (7742712298104).

Almost surely, 2^{51515665155505} is an apocalyptic number.

It is an amenable number.

51515665155505 is a deficient number, since it is larger than the sum of its proper divisors (10426033229327).

51515665155505 is a wasteful number, since it uses less digits than its factorization.

51515665155505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20483366375.

The product of its (nonzero) digits is 14062500, while the sum is 55.

The spelling of 51515665155505 in words is "fifty-one trillion, five hundred fifteen billion, six hundred sixty-five million, one hundred fifty-five thousand, five hundred five".