6660616655 has 16 divisors (see below), whose sum is σ = 9964975104. Its totient is φ = 4152072480.

The previous prime is 6660616597. The next prime is 6660616681. The reversal of 6660616655 is 5566160666.

It is not a de Polignac number, because 6660616655 - 2¹⁰ = 6660615631 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8649767 + ... + 8650536.

It is an arithmetic number, because the mean of its divisors is an integer number (622810944).

Almost surely, 2^6660616655 is an apocalyptic number.

6660616655 is a deficient number, since it is larger than the sum of its proper divisors (3304358449).

6660616655 is a wasteful number, since it uses less digits than its factorization.

6660616655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17300326.

The product of its (nonzero) digits is 1166400, while the sum is 47.

The square root of 6660616655 is about 81612.6010797352. The cubic root of 6660616655 is about 1881.5025575578.

The spelling of 6660616655 in words is "six billion, six hundred sixty million, six hundred sixteen thousand, six hundred fifty-five".