66660000001001 has 32 divisors (see below), whose sum is σ = 75084505493760. Its totient is φ = 58653566899200.

The previous prime is 66660000000991. The next prime is 66660000001019. The reversal of 66660000001001 is 10010000006666.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66660000001001 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66660000001601) 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, 98336060 + ... + 99011618.

It is an arithmetic number, because the mean of its divisors is an integer number (2346390796680).

Almost surely, 2^{66660000001001} is an apocalyptic number.

It is an amenable number.

66660000001001 is a deficient number, since it is larger than the sum of its proper divisors (8424505492759).

66660000001001 is a wasteful number, since it uses less digits than its factorization.

66660000001001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 677345.

The product of its (nonzero) digits is 1296, while the sum is 26.

Adding to 66660000001001 its reverse (10010000006666), we get a palindrome (76670000007667).

The spelling of 66660000001001 in words is "sixty-six trillion, six hundred sixty billion, one thousand, one".