66665015001 has 24 divisors (see below), whose sum is σ = 103710614280. Its totient is φ = 41020874496.

The previous prime is 66665014979. The next prime is 66665015017. The reversal of 66665015001 is 10051056666.

It can be written as a sum of positive squares in 4 ways, for example, as 27431309376 + 39233705625 = 165624^2 + 198075^2 .

It is not a de Polignac number, because 66665015001 - 2⁶ = 66665014937 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66665015201) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1810365 + ... + 1846821.

It is an arithmetic number, because the mean of its divisors is an integer number (4321275595).

Almost surely, 2^66665015001 is an apocalyptic number.

It is an amenable number.

66665015001 is a deficient number, since it is larger than the sum of its proper divisors (37045599279).

66665015001 is a wasteful number, since it uses less digits than its factorization.

66665015001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52105 (or 52102 counting only the distinct ones).

The product of its (nonzero) digits is 32400, while the sum is 36.

The spelling of 66665015001 in words is "sixty-six billion, six hundred sixty-five million, fifteen thousand, one".