51640147242 has 24 divisors (see below), whose sum is σ = 116030949216. Its totient is φ = 17213382252.

The previous prime is 51640147217. The next prime is 51640147249. The reversal of 51640147242 is 24274104615.

51640147242 is a `hidden beast` number, since 5 + 1 + 6 + 401 + 4 + 7 + 242 = 666.

51640147242 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 51640147197 and 51640147206.

It is not an unprimeable number, because it can be changed into a prime (51640147249) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 53127238 + ... + 53128209.

It is an arithmetic number, because the mean of its divisors is an integer number (4834622884).

Almost surely, 2^51640147242 is an apocalyptic number.

51640147242 is an abundant number, since it is smaller than the sum of its proper divisors (64390801974).

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

51640147242 is a wasteful number, since it uses less digits than its factorization.

51640147242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106255464 (or 106255452 counting only the distinct ones).

The product of its (nonzero) digits is 53760, while the sum is 36.

The spelling of 51640147242 in words is "fifty-one billion, six hundred forty million, one hundred forty-seven thousand, two hundred forty-two".