51665155156615 has 64 divisors (see below), whose sum is σ = 83348097960960. Its totient is φ = 29691622103040.

The previous prime is 51665155156609. The next prime is 51665155156651.

51665155156615 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 51665155156615 - 2⁹ = 51665155156103 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 51665155156615.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 2619330 + ... + 10497199.

It is an arithmetic number, because the mean of its divisors is an integer number (1302314030640).

Almost surely, 2^{51665155156615} is an apocalyptic number.

51665155156615 is a gapful number since it is divisible by the number (55) formed by its first and last digit.

51665155156615 is a deficient number, since it is larger than the sum of its proper divisors (31682942804345).

51665155156615 is a wasteful number, since it uses less digits than its factorization.

51665155156615 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13117352.

The product of its digits is 20250000, while the sum is 58.

The spelling of 51665155156615 in words is "fifty-one trillion, six hundred sixty-five billion, one hundred fifty-five million, one hundred fifty-six thousand, six hundred fifteen".