51505660115555 has 8 divisors (see below), whose sum is σ = 61807042054032. Its totient is φ = 41204361482208.

The previous prime is 51505660115489. The next prime is 51505660115563. The reversal of 51505660115555 is 55551106650515.

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 51505660115555 - 2¹² = 51505660111459 is a prime.

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, 19457897 + ... + 21945866.

It is an arithmetic number, because the mean of its divisors is an integer number (7725880256754).

Almost surely, 2^{51505660115555} is an apocalyptic number.

51505660115555 is a deficient number, since it is larger than the sum of its proper divisors (10301381938477).

51505660115555 is a wasteful number, since it uses less digits than its factorization.

51505660115555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41652565.

The product of its (nonzero) digits is 2812500, while the sum is 50.

The spelling of 51505660115555 in words is "fifty-one trillion, five hundred five billion, six hundred sixty million, one hundred fifteen thousand, five hundred fifty-five".