66717644012403 has 4 divisors (see below), whose sum is σ = 88956858683208. Its totient is φ = 44478429341600.

The previous prime is 66717644012359. The next prime is 66717644012441. The reversal of 66717644012403 is 30421044671766.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 66717644012403 - 2⁸ = 66717644012147 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66717644012203) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11119607335398 + ... + 11119607335403.

It is an arithmetic number, because the mean of its divisors is an integer number (22239214670802).

Almost surely, 2^{66717644012403} is an apocalyptic number.

66717644012403 is a deficient number, since it is larger than the sum of its proper divisors (22239214670805).

66717644012403 is a wasteful number, since it uses less digits than its factorization.

66717644012403 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22239214670804.

The product of its (nonzero) digits is 4064256, while the sum is 51.

The spelling of 66717644012403 in words is "sixty-six trillion, seven hundred seventeen billion, six hundred forty-four million, twelve thousand, four hundred three".