66719601993117 has 4 divisors (see below), whose sum is σ = 88959469324160. Its totient is φ = 44479734662076.

The previous prime is 66719601993089. The next prime is 66719601993127. The reversal of 66719601993117 is 71139910691766.

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 not a de Polignac number, because 66719601993117 - 2⁶ = 66719601993053 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66719601993127) 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, 11119933665517 + ... + 11119933665522.

It is an arithmetic number, because the mean of its divisors is an integer number (22239867331040).

Almost surely, 2^{66719601993117} is an apocalyptic number.

It is an amenable number.

66719601993117 is a deficient number, since it is larger than the sum of its proper divisors (22239867331043).

66719601993117 is a wasteful number, since it uses less digits than its factorization.

66719601993117 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22239867331042.

The product of its (nonzero) digits is 23147208, while the sum is 66.

The spelling of 66719601993117 in words is "sixty-six trillion, seven hundred nineteen billion, six hundred one million, nine hundred ninety-three thousand, one hundred seventeen".