636140660424 has 64 divisors (see below), whose sum is σ = 1634280762240. Its totient is φ = 206222307840.

The previous prime is 636140660423. The next prime is 636140660459. The reversal of 636140660424 is 424066041636.

It is not an unprimeable number, because it can be changed into a prime (636140660423) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 707764 + ... + 1331619.

It is an arithmetic number, because the mean of its divisors is an integer number (25535636910).

Almost surely, 2^636140660424 is an apocalyptic number.

It is an amenable number.

636140660424 is an abundant number, since it is smaller than the sum of its proper divisors (998140101816).

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

636140660424 is a wasteful number, since it uses less digits than its factorization.

636140660424 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2039750 (or 2039746 counting only the distinct ones).

The product of its (nonzero) digits is 497664, while the sum is 42.

The spelling of 636140660424 in words is "six hundred thirty-six billion, one hundred forty million, six hundred sixty thousand, four hundred twenty-four".