642211935140 has 24 divisors (see below), whose sum is σ = 1355632870200. Its totient is φ = 255553763328.

The previous prime is 642211935109. The next prime is 642211935181. The reversal of 642211935140 is 41539112246.

It can be written as a sum of positive squares in 4 ways, for example, as 116749322596 + 525462612544 = 341686^2 + 724888^2 .

It is a junction number, because it is equal to n+sod(n) for n = 642211935094 and 642211935103.

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, 83184215 + ... + 83191934.

It is an arithmetic number, because the mean of its divisors is an integer number (56484702925).

Almost surely, 2^642211935140 is an apocalyptic number.

It is an amenable number.

642211935140 is an abundant number, since it is smaller than the sum of its proper divisors (713420935060).

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

642211935140 is a wasteful number, since it uses less digits than its factorization.

642211935140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 166376351 (or 166376349 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 38.

The spelling of 642211935140 in words is "six hundred forty-two billion, two hundred eleven million, nine hundred thirty-five thousand, one hundred forty".