642756843644 has 24 divisors (see below), whose sum is σ = 1129472282400. Its totient is φ = 320053187520.

The previous prime is 642756843613. The next prime is 642756843647. The reversal of 642756843644 is 446348657246.

642756843644 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642756843647) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 611702 + ... + 1288290.

It is an arithmetic number, because the mean of its divisors is an integer number (47061345100).

Almost surely, 2^642756843644 is an apocalyptic number.

It is an amenable number.

642756843644 is a deficient number, since it is larger than the sum of its proper divisors (486715438756).

642756843644 is a wasteful number, since it uses less digits than its factorization.

642756843644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 677573 (or 677571 counting only the distinct ones).

The product of its digits is 92897280, while the sum is 59.

The spelling of 642756843644 in words is "six hundred forty-two billion, seven hundred fifty-six million, eight hundred forty-three thousand, six hundred forty-four".