51438642321455 has 16 divisors (see below), whose sum is σ = 61822218759840. Its totient is φ = 41087025881088.

The previous prime is 51438642321413. The next prime is 51438642321481. The reversal of 51438642321455 is 55412324683415.

It is a cyclic number.

It is not a de Polignac number, because 51438642321455 - 2²⁸ = 51438373885999 is a prime.

It is a super-4 number, since 4×51438642321455⁴ (a number of 56 digits) contains 4444 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 51438642321397 and 51438642321406.

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, 38246051 + ... + 39568139.

It is an arithmetic number, because the mean of its divisors is an integer number (3863888672490).

Almost surely, 2^{51438642321455} is an apocalyptic number.

51438642321455 is a deficient number, since it is larger than the sum of its proper divisors (10383576438385).

51438642321455 is a wasteful number, since it uses less digits than its factorization.

51438642321455 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1334170.

The product of its digits is 13824000, while the sum is 53.

The spelling of 51438642321455 in words is "fifty-one trillion, four hundred thirty-eight billion, six hundred forty-two million, three hundred twenty-one thousand, four hundred fifty-five".