616165638 has 24 divisors (see below), whose sum is σ = 1354547544. Its totient is φ = 186716640.

The previous prime is 616165633. The next prime is 616165679. The reversal of 616165638 is 836561616.

It is an alternating number because its digits alternate between even and odd.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 616165638.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (616165633) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 423631 + ... + 425082.

It is an arithmetic number, because the mean of its divisors is an integer number (56439481).

Almost surely, 2^616165638 is an apocalyptic number.

616165638 is an abundant number, since it is smaller than the sum of its proper divisors (738381906).

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

616165638 is a wasteful number, since it uses less digits than its factorization.

616165638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 848740 (or 848729 counting only the distinct ones).

The product of its digits is 155520, while the sum is 42.

The square root of 616165638 is about 24822.6839402994. The cubic root of 616165638 is about 850.9404299546.

The spelling of 616165638 in words is "six hundred sixteen million, one hundred sixty-five thousand, six hundred thirty-eight".