6645418941 has 12 divisors (see below), whose sum is σ = 10126921952. Its totient is φ = 3797168784.

The previous prime is 6645418937. The next prime is 6645418979. The reversal of 6645418941 is 1498145466.

It is not a de Polignac number, because 6645418941 - 2² = 6645418937 is a prime.

It is a super-2 number, since 2×6645418941² = 88323185802803122962, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6645418441) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 364675 + ... + 382463.

Almost surely, 2^6645418941 is an apocalyptic number.

It is an amenable number.

6645418941 is a deficient number, since it is larger than the sum of its proper divisors (3481503011).

6645418941 is an frugal number, since it uses more digits than its factorization.

6645418941 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35588 (or 17799 counting only the distinct ones).

The product of its digits is 829440, while the sum is 48.

The square root of 6645418941 is about 81519.4390375694. The cubic root of 6645418941 is about 1880.0704422262.

The spelling of 6645418941 in words is "six billion, six hundred forty-five million, four hundred eighteen thousand, nine hundred forty-one".