6660669641 has 4 divisors (see below), whose sum is σ = 6875529984. Its totient is φ = 6445809300.

The previous prime is 6660669623. The next prime is 6660669667. The reversal of 6660669641 is 1469660666.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6660669641 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 6660669641.

It is not an unprimeable number, because it can be changed into a prime (6660669601) 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, 107430125 + ... + 107430186.

It is an arithmetic number, because the mean of its divisors is an integer number (1718882496).

Almost surely, 2^6660669641 is an apocalyptic number.

It is an amenable number.

6660669641 is a deficient number, since it is larger than the sum of its proper divisors (214860343).

6660669641 is a wasteful number, since it uses less digits than its factorization.

6660669641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 214860342.

The product of its (nonzero) digits is 1679616, while the sum is 50.

The square root of 6660669641 is about 81612.9256980780. The cubic root of 6660669641 is about 1881.5075467370.

The spelling of 6660669641 in words is "six billion, six hundred sixty million, six hundred sixty-nine thousand, six hundred forty-one".