642243990316 has 6 divisors (see below), whose sum is σ = 1123926983060. Its totient is φ = 321121995156.

The previous prime is 642243990259. The next prime is 642243990337. The reversal of 642243990316 is 613099342246.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 642243990316.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80280498786 + ... + 80280498793.

Almost surely, 2^642243990316 is an apocalyptic number.

It is an amenable number.

642243990316 is a deficient number, since it is larger than the sum of its proper divisors (481682992744).

642243990316 is a wasteful number, since it uses less digits than its factorization.

642243990316 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 160560997583 (or 160560997581 counting only the distinct ones).

The product of its (nonzero) digits is 1679616, while the sum is 49.

The spelling of 642243990316 in words is "six hundred forty-two billion, two hundred forty-three million, nine hundred ninety thousand, three hundred sixteen".