6656661003 has 4 divisors (see below), whose sum is σ = 8875548008. Its totient is φ = 4437774000.

The previous prime is 6656660999. The next prime is 6656661023. The reversal of 6656661003 is 3001666566.

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

It is not a de Polignac number, because 6656661003 - 2² = 6656660999 is a prime.

It is a super-2 number, since 2×6656661003² = 88622271417721932018, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6656661023) 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, 1109443498 + ... + 1109443503.

It is an arithmetic number, because the mean of its divisors is an integer number (2218887002).

Almost surely, 2^6656661003 is an apocalyptic number.

6656661003 is a deficient number, since it is larger than the sum of its proper divisors (2218887005).

6656661003 is a wasteful number, since it uses less digits than its factorization.

6656661003 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2218887004.

The product of its (nonzero) digits is 116640, while the sum is 39.

The square root of 6656661003 is about 81588.3631592153. The cubic root of 6656661003 is about 1881.1300173174.

The spelling of 6656661003 in words is "six billion, six hundred fifty-six million, six hundred sixty-one thousand, three".