616561868 has 24 divisors (see below), whose sum is σ = 1166827200. Its totient is φ = 283380480.

The previous prime is 616561867. The next prime is 616561877. The reversal of 616561868 is 868165616.

It is a Smith number, since the sum of its digits (47) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (616561867) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12068 + ... + 37131.

It is an arithmetic number, because the mean of its divisors is an integer number (48617800).

Almost surely, 2^616561868 is an apocalyptic number.

It is an amenable number.

616561868 is a deficient number, since it is larger than the sum of its proper divisors (550265332).

616561868 is a wasteful number, since it uses less digits than its factorization.

616561868 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49457 (or 49455 counting only the distinct ones).

The product of its digits is 414720, while the sum is 47.

The square root of 616561868 is about 24830.6638654709. The cubic root of 616561868 is about 851.1227921089.

The spelling of 616561868 in words is "six hundred sixteen million, five hundred sixty-one thousand, eight hundred sixty-eight".