51456665415 has 16 divisors (see below), whose sum is σ = 82823666688. Its totient is φ = 27279220896.

The previous prime is 51456665413. The next prime is 51456665453.

51456665415 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 51456665415 - 2¹ = 51456665413 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51456665413) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10268287 + ... + 10273296.

It is an arithmetic number, because the mean of its divisors is an integer number (5176479168).

Almost surely, 2^51456665415 is an apocalyptic number.

51456665415 is a deficient number, since it is larger than the sum of its proper divisors (31367001273).

51456665415 is a wasteful number, since it uses less digits than its factorization.

51456665415 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20541758.

The product of its digits is 2160000, while the sum is 48.

The spelling of 51456665415 in words is "fifty-one billion, four hundred fifty-six million, six hundred sixty-five thousand, four hundred fifteen".