66717038445 has 32 divisors (see below), whose sum is σ = 107369011200. Its totient is φ = 35375538240.

The previous prime is 66717038429. The next prime is 66717038447. The reversal of 66717038445 is 54483071766.

It is a happy number.

It is not a de Polignac number, because 66717038445 - 2⁴ = 66717038429 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66717038447) 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, 3049656 + ... + 3071454.

It is an arithmetic number, because the mean of its divisors is an integer number (3355281600).

Almost surely, 2^66717038445 is an apocalyptic number.

It is an amenable number.

66717038445 is a deficient number, since it is larger than the sum of its proper divisors (40651972755).

66717038445 is a wasteful number, since it uses less digits than its factorization.

66717038445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22985.

The product of its (nonzero) digits is 3386880, while the sum is 51.

The spelling of 66717038445 in words is "sixty-six billion, seven hundred seventeen million, thirty-eight thousand, four hundred forty-five".