66359440401 has 4 divisors (see below), whose sum is σ = 88479253872. Its totient is φ = 44239626932.

The previous prime is 66359440363. The next prime is 66359440423. The reversal of 66359440401 is 10404495366.

It is a happy number.

66359440401 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 66359440401 - 2¹⁷ = 66359309329 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (66359444401) 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, 11059906731 + ... + 11059906736.

It is an arithmetic number, because the mean of its divisors is an integer number (22119813468).

Almost surely, 2^66359440401 is an apocalyptic number.

It is an amenable number.

66359440401 is a deficient number, since it is larger than the sum of its proper divisors (22119813471).

66359440401 is a wasteful number, since it uses less digits than its factorization.

66359440401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22119813470.

The product of its (nonzero) digits is 311040, while the sum is 42.

The spelling of 66359440401 in words is "sixty-six billion, three hundred fifty-nine million, four hundred forty thousand, four hundred one".