6641997264 has 60 divisors (see below), whose sum is σ = 21243851616. Its totient is φ = 1897713216.

The previous prime is 6641997251. The next prime is 6641997269. The reversal of 6641997264 is 4627991466.

It is a happy number.

It is a super-2 number, since 2×6641997264² = 88232255309966971392, which contains 22 as substring.

It is a nude number because it is divisible by every one of its digits.

It is a self number, because there is not a number n which added to its sum of digits gives 6641997264.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6641997269) 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 11 ways as a sum of consecutive naturals, for example, 3293634 + ... + 3295649.

Almost surely, 2^6641997264 is an apocalyptic number.

It is an amenable number.

6641997264 is an abundant number, since it is smaller than the sum of its proper divisors (14601854352).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

6641997264 is a wasteful number, since it uses less digits than its factorization.

6641997264 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6589304 (or 6589295 counting only the distinct ones).

The product of its digits is 3919104, while the sum is 54.

The square root of 6641997264 is about 81498.4494576431. The cubic root of 6641997264 is about 1879.7477087129.

The spelling of 6641997264 in words is "six billion, six hundred forty-one million, nine hundred ninety-seven thousand, two hundred sixty-four".