6641575668 has 96 divisors (see below), whose sum is σ = 21192523520. Its totient is φ = 1751621760.

The previous prime is 6641575667. The next prime is 6641575727. The reversal of 6641575668 is 8665751466.

6641575668 is a `hidden beast` number, since 6 + 6 + 4 + 1 + 575 + 6 + 68 = 666.

It is a super-2 number, since 2×6641575668² = 88221054707539292448, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6641575667) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 328063 + ... + 347718.

Almost surely, 2^6641575668 is an apocalyptic number.

It is an amenable number.

6641575668 is an abundant number, since it is smaller than the sum of its proper divisors (14550947852).

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

6641575668 is a wasteful number, since it uses less digits than its factorization.

6641575668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 675814 (or 675806 counting only the distinct ones).

The product of its digits is 7257600, while the sum is 54.

The square root of 6641575668 is about 81495.8628888608. The cubic root of 6641575668 is about 1879.7079359934.

The spelling of 6641575668 in words is "six billion, six hundred forty-one million, five hundred seventy-five thousand, six hundred sixty-eight".