6616120015 has 4 divisors (see below), whose sum is σ = 7939344024. Its totient is φ = 5292896008.

The previous prime is 6616119971. The next prime is 6616120033. The reversal of 6616120015 is 5100216166.

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 6616120015 - 2²⁹ = 6079249103 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 661611997 + ... + 661612006.

It is an arithmetic number, because the mean of its divisors is an integer number (1984836006).

Almost surely, 2^6616120015 is an apocalyptic number.

6616120015 is a deficient number, since it is larger than the sum of its proper divisors (1323224009).

6616120015 is a wasteful number, since it uses less digits than its factorization.

6616120015 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1323224008.

The product of its (nonzero) digits is 2160, while the sum is 28.

The square root of 6616120015 is about 81339.5353748717. The cubic root of 6616120015 is about 1877.3033632656.

It can be divided in two parts, 661 and 6120015, that added together give a square (6120676 = 2474²).

The spelling of 6616120015 in words is "six billion, six hundred sixteen million, one hundred twenty thousand, fifteen".