51493581555 has 64 divisors (see below), whose sum is σ = 89886031872. Its totient is φ = 25021301760.

The previous prime is 51493581539. The next prime is 51493581569. The reversal of 51493581555 is 55518539415.

It is not a de Polignac number, because 51493581555 - 2⁴ = 51493581539 is a prime.

It is a super-2 number, since 2×51493581555² (a number of 22 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 51493581498 and 51493581507.

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, 6282510 + ... + 6290700.

It is an arithmetic number, because the mean of its divisors is an integer number (1404469248).

Almost surely, 2^51493581555 is an apocalyptic number.

51493581555 is a deficient number, since it is larger than the sum of its proper divisors (38392450317).

51493581555 is a wasteful number, since it uses less digits than its factorization.

51493581555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8628.

The product of its digits is 2700000, while the sum is 51.

The spelling of 51493581555 in words is "fifty-one billion, four hundred ninety-three million, five hundred eighty-one thousand, five hundred fifty-five".