642069916 has 6 divisors (see below), whose sum is σ = 1123622360. Its totient is φ = 321034956.

The previous prime is 642069899. The next prime is 642069929. The reversal of 642069916 is 619960246.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80258736 + ... + 80258743.

Almost surely, 2^642069916 is an apocalyptic number.

It is an amenable number.

642069916 is a deficient number, since it is larger than the sum of its proper divisors (481552444).

642069916 is a wasteful number, since it uses less digits than its factorization.

642069916 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 160517483 (or 160517481 counting only the distinct ones).

The product of its (nonzero) digits is 139968, while the sum is 43.

The square root of 642069916 is about 25339.0985632875. The cubic root of 642069916 is about 862.7019384614.

The spelling of 642069916 in words is "six hundred forty-two million, sixty-nine thousand, nine hundred sixteen".