51611655611615 has 16 divisors (see below), whose sum is σ = 67587432514560. Its totient is φ = 37522925452320.

The previous prime is 51611655611573. The next prime is 51611655611627.

51611655611615 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 51611655611615 - 2¹⁶ = 51611655546079 is a prime.

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, 160138595 + ... + 160460564.

It is an arithmetic number, because the mean of its divisors is an integer number (4224214532160).

Almost surely, 2^{51611655611615} is an apocalyptic number.

51611655611615 is a gapful number since it is divisible by the number (55) formed by its first and last digit.

51611655611615 is a deficient number, since it is larger than the sum of its proper divisors (15975776902945).

51611655611615 is a wasteful number, since it uses less digits than its factorization.

51611655611615 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 320602102.

The product of its digits is 810000, while the sum is 50.

The spelling of 51611655611615 in words is "fifty-one trillion, six hundred eleven billion, six hundred fifty-five million, six hundred eleven thousand, six hundred fifteen".