66717644012225 has 12 divisors (see below), whose sum is σ = 83145606614400. Its totient is φ = 53105903571600.

The previous prime is 66717644012207. The next prime is 66717644012359. The reversal of 66717644012225 is 52221044671766.

It is not a de Polignac number, because 66717644012225 - 2⁸ = 66717644011969 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6705285881 + ... + 6705295830.

It is an arithmetic number, because the mean of its divisors is an integer number (6928800551200).

Almost surely, 2^{66717644012225} is an apocalyptic number.

It is an amenable number.

66717644012225 is a deficient number, since it is larger than the sum of its proper divisors (16427962602175).

66717644012225 is a wasteful number, since it uses less digits than its factorization.

66717644012225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13410581920 (or 13410581915 counting only the distinct ones).

The product of its (nonzero) digits is 6773760, while the sum is 53.

The spelling of 66717644012225 in words is "sixty-six trillion, seven hundred seventeen billion, six hundred forty-four million, twelve thousand, two hundred twenty-five".