51740439660 has 648 divisors, whose sum is σ = 204495192720. Its totient is φ = 10899028224.

The previous prime is 51740439649. The next prime is 51740439689. The reversal of 51740439660 is 6693404715.

51740439660 is a `hidden beast` number, since 517 + 4 + 0 + 43 + 96 + 6 + 0 = 666.

51740439660 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 215 ways as a sum of consecutive naturals, for example, 83586831 + ... + 83587449.

Almost surely, 2^51740439660 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51740439660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (102247596360).

51740439660 is an abundant number, since it is smaller than the sum of its proper divisors (152754753060).

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

51740439660 is a wasteful number, since it uses less digits than its factorization.

51740439660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 679 (or 649 counting only the distinct ones).

The product of its (nonzero) digits is 544320, while the sum is 45.

The spelling of 51740439660 in words is "fifty-one billion, seven hundred forty million, four hundred thirty-nine thousand, six hundred sixty".