642386388410 has 32 divisors (see below), whose sum is σ = 1252609641360. Its totient is φ = 237188812224.

The previous prime is 642386388401. The next prime is 642386388431. The reversal of 642386388410 is 14883683246.

It is a happy number.

642386388410 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 8 ways, for example, as 115642843969 + 526743544441 = 340063^2 + 725771^2 .

It is a Curzon 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, 14597657 + ... + 14641596.

Almost surely, 2^642386388410 is an apocalyptic number.

642386388410 is a deficient number, since it is larger than the sum of its proper divisors (610223252950).

642386388410 is a wasteful number, since it uses less digits than its factorization.

642386388410 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29239299 (or 29239273 counting only the distinct ones).

The product of its (nonzero) digits is 5308416, while the sum is 53.

The spelling of 642386388410 in words is "six hundred forty-two billion, three hundred eighty-six million, three hundred eighty-eight thousand, four hundred ten".