616661015 has 4 divisors (see below), whose sum is σ = 739993224. Its totient is φ = 493328808.

The previous prime is 616661011. The next prime is 616661053. The reversal of 616661015 is 510166616.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 616661015 - 2² = 616661011 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (616661011) 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, 61666097 + ... + 61666106.

It is an arithmetic number, because the mean of its divisors is an integer number (184998306).

Almost surely, 2^616661015 is an apocalyptic number.

616661015 is a deficient number, since it is larger than the sum of its proper divisors (123332209).

616661015 is a wasteful number, since it uses less digits than its factorization.

616661015 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 123332208.

The product of its (nonzero) digits is 6480, while the sum is 32.

The square root of 616661015 is about 24832.6602481490. The cubic root of 616661015 is about 851.1684116177.

The spelling of 616661015 in words is "six hundred sixteen million, six hundred sixty-one thousand, fifteen".