616652661 has 4 divisors (see below), whose sum is σ = 822203552. Its totient is φ = 411101772.

The previous prime is 616652653. The next prime is 616652689. The reversal of 616652661 is 166256616.

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 not a de Polignac number, because 616652661 - 2³ = 616652653 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (616652161) 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, 102775441 + ... + 102775446.

It is an arithmetic number, because the mean of its divisors is an integer number (205550888).

Almost surely, 2^616652661 is an apocalyptic number.

It is an amenable number.

616652661 is a deficient number, since it is larger than the sum of its proper divisors (205550891).

616652661 is a wasteful number, since it uses less digits than its factorization.

616652661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 205550890.

The product of its digits is 77760, while the sum is 39.

The square root of 616652661 is about 24832.4920416780. The cubic root of 616652661 is about 851.1645679646.

The spelling of 616652661 in words is "six hundred sixteen million, six hundred fifty-two thousand, six hundred sixty-one".