616577818639 has 4 divisors (see below), whose sum is σ = 637839122760. Its totient is φ = 595316514520.

The previous prime is 616577818631. The next prime is 616577818687. The reversal of 616577818639 is 936818775616.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 616577818639 - 2³ = 616577818631 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (616577818631) 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, 10630652017 + ... + 10630652074.

It is an arithmetic number, because the mean of its divisors is an integer number (159459780690).

Almost surely, 2^616577818639 is an apocalyptic number.

616577818639 is a deficient number, since it is larger than the sum of its proper divisors (21261304121).

616577818639 is a wasteful number, since it uses less digits than its factorization.

616577818639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21261304120.

The product of its digits is 91445760, while the sum is 67.

The spelling of 616577818639 in words is "six hundred sixteen billion, five hundred seventy-seven million, eight hundred eighteen thousand, six hundred thirty-nine".