51533610240 has 144 divisors (see below), whose sum is σ = 188097775488. Its totient is φ = 11779104768.

The previous prime is 51533610221. The next prime is 51533610277. The reversal of 51533610240 is 4201633515.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 51533610198 and 51533610207.

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, 931707 + ... + 985466.

It is an arithmetic number, because the mean of its divisors is an integer number (1306234552).

Almost surely, 2^51533610240 is an apocalyptic number.

It is an amenable number.

51533610240 is an abundant number, since it is smaller than the sum of its proper divisors (136564165248).

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

51533610240 is a wasteful number, since it uses less digits than its factorization.

51533610240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1917204 (or 1917190 counting only the distinct ones).

The product of its (nonzero) digits is 10800, while the sum is 30.

The spelling of 51533610240 in words is "fifty-one billion, five hundred thirty-three million, six hundred ten thousand, two hundred forty".