51251555140 has 96 divisors (see below), whose sum is σ = 111342325248. Its totient is φ = 19805760000.

The previous prime is 51251555129. The next prime is 51251555161. The reversal of 51251555140 is 4155515215.

It is a junction number, because it is equal to n+sod(n) for n = 51251555096 and 51251555105.

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, 43766755 + ... + 43767925.

It is an arithmetic number, because the mean of its divisors is an integer number (1159815888).

Almost surely, 2^51251555140 is an apocalyptic number.

It is an amenable number.

51251555140 is an abundant number, since it is smaller than the sum of its proper divisors (60090770108).

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

51251555140 is a wasteful number, since it uses less digits than its factorization.

51251555140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1789 (or 1787 counting only the distinct ones).

The product of its (nonzero) digits is 25000, while the sum is 34.

The spelling of 51251555140 in words is "fifty-one billion, two hundred fifty-one million, five hundred fifty-five thousand, one hundred forty".