642502409068 has 12 divisors (see below), whose sum is σ = 1210869924880. Its totient is φ = 296539573392.

The previous prime is 642502409063. The next prime is 642502409071. The reversal of 642502409068 is 860904205246.

It is not an unprimeable number, because it can be changed into a prime (642502409063) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6177907728 + ... + 6177907831.

Almost surely, 2^642502409068 is an apocalyptic number.

It is an amenable number.

642502409068 is a deficient number, since it is larger than the sum of its proper divisors (568367515812).

642502409068 is a wasteful number, since it uses less digits than its factorization.

642502409068 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12355815576 (or 12355815574 counting only the distinct ones).

The product of its (nonzero) digits is 829440, while the sum is 46.

The spelling of 642502409068 in words is "six hundred forty-two billion, five hundred two million, four hundred nine thousand, sixty-eight".