6640269969 has 32 divisors (see below), whose sum is σ = 9215838720. Its totient is φ = 4249631232.

The previous prime is 6640269943. The next prime is 6640269971. The reversal of 6640269969 is 9699620466.

It is a de Polignac number, because none of the positive numbers 2^k-6640269969 is a prime.

It is a super-2 number, since 2×6640269969² = 88186370522406521922, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (6640269469) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 7147297 + ... + 7148225.

It is an arithmetic number, because the mean of its divisors is an integer number (287994960).

Almost surely, 2^6640269969 is an apocalyptic number.

It is an amenable number.

6640269969 is a deficient number, since it is larger than the sum of its proper divisors (2575568751).

6640269969 is a wasteful number, since it uses less digits than its factorization.

6640269969 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1869.

The product of its (nonzero) digits is 7558272, while the sum is 57.

The square root of 6640269969 is about 81487.8516651409. The cubic root of 6640269969 is about 1879.5847476744.

The spelling of 6640269969 in words is "six billion, six hundred forty million, two hundred sixty-nine thousand, nine hundred sixty-nine".