6666525040 has 40 divisors (see below), whose sum is σ = 17713910880. Its totient is φ = 2285665536.

The previous prime is 6666525031. The next prime is 6666525043. The reversal of 6666525040 is 405256666.

It is a tau number, because it is divible by the number of its divisors (40).

It is a super-2 number, since 2×6666525040² = 88885112217894003200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a junction number, because it is equal to n+sod(n) for n = 6666524984 and 6666525002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6666525043) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5951695 + ... + 5952814.

It is an arithmetic number, because the mean of its divisors is an integer number (442847772).

Almost surely, 2^6666525040 is an apocalyptic number.

It is an amenable number.

6666525040 is an abundant number, since it is smaller than the sum of its proper divisors (11047385840).

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

6666525040 is a wasteful number, since it uses less digits than its factorization.

6666525040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11904529 (or 11904523 counting only the distinct ones).

The product of its (nonzero) digits is 259200, while the sum is 40.

The square root of 6666525040 is about 81648.7908054982. The cubic root of 6666525040 is about 1882.0587300881.

The spelling of 6666525040 in words is "six billion, six hundred sixty-six million, five hundred twenty-five thousand, forty".