66069318401 has 4 divisors (see below), whose sum is σ = 66145876992. Its totient is φ = 65992759812.

The previous prime is 66069318397. The next prime is 66069318407. The reversal of 66069318401 is 10481396066.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 66069318401 - 2² = 66069318397 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66069318407) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 38278001 + ... + 38279726.

It is an arithmetic number, because the mean of its divisors is an integer number (16536469248).

Almost surely, 2^66069318401 is an apocalyptic number.

It is an amenable number.

66069318401 is a deficient number, since it is larger than the sum of its proper divisors (76558591).

66069318401 is an equidigital number, since it uses as much as digits as its factorization.

66069318401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 76558590.

The product of its (nonzero) digits is 186624, while the sum is 44.

The spelling of 66069318401 in words is "sixty-six billion, sixty-nine million, three hundred eighteen thousand, four hundred one".