66338194377 has 16 divisors (see below), whose sum is σ = 108862678400. Its totient is φ = 34991574912.

The previous prime is 66338194357. The next prime is 66338194387. The reversal of 66338194377 is 77349183366.

It is not a de Polignac number, because 66338194377 - 2⁶ = 66338194313 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66338194357) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 121498252 + ... + 121498797.

It is an arithmetic number, because the mean of its divisors is an integer number (6803917400).

Almost surely, 2^66338194377 is an apocalyptic number.

It is an amenable number.

66338194377 is a deficient number, since it is larger than the sum of its proper divisors (42524484023).

66338194377 is a wasteful number, since it uses less digits than its factorization.

66338194377 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 242997072.

The product of its digits is 13716864, while the sum is 57.

The spelling of 66338194377 in words is "sixty-six billion, three hundred thirty-eight million, one hundred ninety-four thousand, three hundred seventy-seven".