616577886781 has 4 divisors (see below), whose sum is σ = 636467496064. Its totient is φ = 596688277500.

The previous prime is 616577886739. The next prime is 616577886791. The reversal of 616577886781 is 187688775616.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 616577886781 - 2⁷ = 616577886653 is a prime.

It is a super-2 number, since 2×616577886781² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 616577886781.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (616577886721) 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, 9944804595 + ... + 9944804656.

It is an arithmetic number, because the mean of its divisors is an integer number (159116874016).

Almost surely, 2^616577886781 is an apocalyptic number.

It is an amenable number.

616577886781 is a deficient number, since it is larger than the sum of its proper divisors (19889609283).

616577886781 is a wasteful number, since it uses less digits than its factorization.

616577886781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19889609282.

The product of its digits is 189665280, while the sum is 70.

The spelling of 616577886781 in words is "six hundred sixteen billion, five hundred seventy-seven million, eight hundred eighty-six thousand, seven hundred eighty-one".