6665655605601 has 32 divisors (see below), whose sum is σ = 9394498713600. Its totient is φ = 4195582959744.

The previous prime is 6665655605597. The next prime is 6665655605663. The reversal of 6665655605601 is 1065065565666.

It is not a de Polignac number, because 6665655605601 - 2² = 6665655605597 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (6665655605681) 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, 654325 + ... + 3709373.

It is an arithmetic number, because the mean of its divisors is an integer number (293578084800).

Almost surely, 2^{6665655605601} is an apocalyptic number.

It is an amenable number.

6665655605601 is a deficient number, since it is larger than the sum of its proper divisors (2728843107999).

6665655605601 is a wasteful number, since it uses less digits than its factorization.

6665655605601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3055485.

The product of its (nonzero) digits is 29160000, while the sum is 57.

The spelling of 6665655605601 in words is "six trillion, six hundred sixty-five billion, six hundred fifty-five million, six hundred five thousand, six hundred one".