616100661 has 30 divisors (see below), whose sum is σ = 1011638166. Its totient is φ = 373388400.

The previous prime is 616100659. The next prime is 616100663. The reversal of 616100661 is 166001616.

It is an interprime number because it is at equal distance from previous prime (616100659) and next prime (616100663).

It can be written as a sum of positive squares in only one way, i.e., 612562500 + 3538161 = 24750^2 + 1881^2 .

It is not a de Polignac number, because 616100661 - 2¹ = 616100659 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (616100663) by changing a digit.

It is a polite number, since it can be written in 29 ways as a sum of consecutive naturals, for example, 21630 + ... + 41231.

Almost surely, 2^616100661 is an apocalyptic number.

It is an amenable number.

616100661 is a deficient number, since it is larger than the sum of its proper divisors (395537505).

616100661 is a wasteful number, since it uses less digits than its factorization.

616100661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62895 (or 62875 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 27.

The square root of 616100661 is about 24821.3750827790. The cubic root of 616100661 is about 850.9105172728.

The spelling of 616100661 in words is "six hundred sixteen million, one hundred thousand, six hundred sixty-one".