642683506840 has 16 divisors (see below), whose sum is σ = 1446037890480. Its totient is φ = 257073402720.

The previous prime is 642683506769. The next prime is 642683506847. The reversal of 642683506840 is 48605386246.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642683506847) 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, 8033543796 + ... + 8033543875.

It is an arithmetic number, because the mean of its divisors is an integer number (90377368155).

Almost surely, 2^642683506840 is an apocalyptic number.

It is an amenable number.

642683506840 is an abundant number, since it is smaller than the sum of its proper divisors (803354383640).

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

642683506840 is a wasteful number, since it uses less digits than its factorization.

642683506840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16067087682 (or 16067087678 counting only the distinct ones).

The product of its (nonzero) digits is 6635520, while the sum is 52.

The spelling of 642683506840 in words is "six hundred forty-two billion, six hundred eighty-three million, five hundred six thousand, eight hundred forty".