6615670661 has 16 divisors (see below), whose sum is σ = 7010551296. Its totient is φ = 6232800000.

The previous prime is 6615670639. The next prime is 6615670669. The reversal of 6615670661 is 1660765166.

It is a cyclic number.

It is not a de Polignac number, because 6615670661 - 2⁶ = 6615670597 is a prime.

It is a super-3 number, since 3×6615670661³ (a number of 30 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6615670669) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 618761 + ... + 629361.

It is an arithmetic number, because the mean of its divisors is an integer number (438159456).

Almost surely, 2^6615670661 is an apocalyptic number.

It is an amenable number.

6615670661 is a deficient number, since it is larger than the sum of its proper divisors (394880635).

6615670661 is a wasteful number, since it uses less digits than its factorization.

6615670661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11164.

The product of its (nonzero) digits is 272160, while the sum is 44.

The square root of 6615670661 is about 81336.7731164693. The cubic root of 6615670661 is about 1877.2608613726.

The spelling of 6615670661 in words is "six billion, six hundred fifteen million, six hundred seventy thousand, six hundred sixty-one".