642404200646 has 16 divisors (see below), whose sum is σ = 1048428112704. Its totient is φ = 293437603584.

The previous prime is 642404200621. The next prime is 642404200679. The reversal of 642404200646 is 646002404246.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 127357550 + ... + 127362593.

It is an arithmetic number, because the mean of its divisors is an integer number (65526757044).

Almost surely, 2^642404200646 is an apocalyptic number.

642404200646 is a deficient number, since it is larger than the sum of its proper divisors (406023912058).

642404200646 is a wasteful number, since it uses less digits than its factorization.

642404200646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 254720255.

The product of its (nonzero) digits is 221184, while the sum is 38.

The spelling of 642404200646 in words is "six hundred forty-two billion, four hundred four million, two hundred thousand, six hundred forty-six".