642675577188 has 12 divisors (see below), whose sum is σ = 1499576346800. Its totient is φ = 214225192392.

The previous prime is 642675577153. The next prime is 642675577199. The reversal of 642675577188 is 881775576246.

It is a tau number, because it is divible by the number of its divisors (12).

It is a hoax number, since the sum of its digits (66) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26778149038 + ... + 26778149061.

Almost surely, 2^642675577188 is an apocalyptic number.

It is an amenable number.

642675577188 is an abundant number, since it is smaller than the sum of its proper divisors (856900769612).

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

642675577188 is a wasteful number, since it uses less digits than its factorization.

642675577188 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53556298106 (or 53556298104 counting only the distinct ones).

The product of its digits is 158054400, while the sum is 66.

The spelling of 642675577188 in words is "six hundred forty-two billion, six hundred seventy-five million, five hundred seventy-seven thousand, one hundred eighty-eight".