6660405607 has 2 divisors, whose sum is σ = 6660405608. Its totient is φ = 6660405606.

The previous prime is 6660405551. The next prime is 6660405617. The reversal of 6660405607 is 7065040666.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6660405607 is a prime.

It is a super-2 number, since 2×6660405607² = 88722005699514076898, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 6660405607.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6660405617) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3330202803 + 3330202804.

It is an arithmetic number, because the mean of its divisors is an integer number (3330202804).

Almost surely, 2^6660405607 is an apocalyptic number.

6660405607 is a deficient number, since it is larger than the sum of its proper divisors (1).

6660405607 is an equidigital number, since it uses as much as digits as its factorization.

6660405607 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 181440, while the sum is 40.

The square root of 6660405607 is about 81611.3080828876. The cubic root of 6660405607 is about 1881.4826849461.

The spelling of 6660405607 in words is "six billion, six hundred sixty million, four hundred five thousand, six hundred seven".