51544123216 has 20 divisors (see below), whose sum is σ = 105741253332. Its totient is φ = 24256057856.

The previous prime is 51544123193. The next prime is 51544123219. The reversal of 51544123216 is 61232144515.

It can be written as a sum of positive squares in 2 ways, for example, as 33453873216 + 18090250000 = 182904^2 + 134500^2 .

It is a Harshad number since it is a multiple of its sum of digits (34).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51544123219) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 94749955 + ... + 94750498.

Almost surely, 2^51544123216 is an apocalyptic number.

It is an amenable number.

51544123216 is an abundant number, since it is smaller than the sum of its proper divisors (54197130116).

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

51544123216 is a wasteful number, since it uses less digits than its factorization.

51544123216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 189500478 (or 189500472 counting only the distinct ones).

The product of its digits is 28800, while the sum is 34.

The spelling of 51544123216 in words is "fifty-one billion, five hundred forty-four million, one hundred twenty-three thousand, two hundred sixteen".