51481271814 has 64 divisors (see below), whose sum is σ = 118919539200. Its totient is φ = 14553312768.

The previous prime is 51481271731. The next prime is 51481271827. The reversal of 51481271814 is 41817218415.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3375534 + ... + 3390750.

It is an arithmetic number, because the mean of its divisors is an integer number (1858117800).

Almost surely, 2^51481271814 is an apocalyptic number.

51481271814 is an abundant number, since it is smaller than the sum of its proper divisors (67438267386).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

51481271814 is a wasteful number, since it uses less digits than its factorization.

51481271814 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16077.

The product of its digits is 71680, while the sum is 42.

The spelling of 51481271814 in words is "fifty-one billion, four hundred eighty-one million, two hundred seventy-one thousand, eight hundred fourteen".