51866666815 has 16 divisors (see below), whose sum is σ = 63839988000. Its totient is φ = 40437185152.

The previous prime is 51866666771. The next prime is 51866666827.

51866666815 is nontrivially palindromic in base 10.

It is a cyclic number.

It is not a de Polignac number, because 51866666815 - 2¹⁹ = 51866142527 is a prime.

It is a super-2 number, since 2×51866666815² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 51866666815.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 617305 + ... + 696274.

It is an arithmetic number, because the mean of its divisors is an integer number (3989999250).

Almost surely, 2^51866666815 is an apocalyptic number.

51866666815 is a deficient number, since it is larger than the sum of its proper divisors (11973321185).

51866666815 is a wasteful number, since it uses less digits than its factorization.

51866666815 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1313786.

The product of its digits is 12441600, while the sum is 58.

The spelling of 51866666815 in words is "fifty-one billion, eight hundred sixty-six million, six hundred sixty-six thousand, eight hundred fifteen".