616115661 has 24 divisors (see below), whose sum is σ = 957063744. Its totient is φ = 351529920.

The previous prime is 616115659. The next prime is 616115671. The reversal of 616115661 is 166511616.

It is not a de Polignac number, because 616115661 - 2¹ = 616115659 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (616115671) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 106401 + ... + 112041.

It is an arithmetic number, because the mean of its divisors is an integer number (39877656).

Almost surely, 2^616115661 is an apocalyptic number.

It is an amenable number.

616115661 is a deficient number, since it is larger than the sum of its proper divisors (340948083).

616115661 is a wasteful number, since it uses less digits than its factorization.

616115661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6401 (or 6394 counting only the distinct ones).

The product of its digits is 6480, while the sum is 33.

The square root of 616115661 is about 24821.6772398644. The cubic root of 616115661 is about 850.9174228295.

The spelling of 616115661 in words is "six hundred sixteen million, one hundred fifteen thousand, six hundred sixty-one".