66190917786097 has 4 divisors (see below), whose sum is σ = 71282526846580. Its totient is φ = 61099308725616.

The previous prime is 66190917786073. The next prime is 66190917786127. The reversal of 66190917786097 is 79068771909166.

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

It can be written as a sum of positive squares in 2 ways, for example, as 22538984130576 + 43651933655521 = 4747524^2 + 6606961^2 .

It is a cyclic number.

It is not a de Polignac number, because 66190917786097 - 2²⁷ = 66190783568369 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66190917786397) 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, 2545804530222 + ... + 2545804530247.

It is an arithmetic number, because the mean of its divisors is an integer number (17820631711645).

Almost surely, 2^{66190917786097} is an apocalyptic number.

It is an amenable number.

66190917786097 is a deficient number, since it is larger than the sum of its proper divisors (5091609060483).

66190917786097 is a wasteful number, since it uses less digits than its factorization.

66190917786097 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5091609060482.

The product of its (nonzero) digits is 432081216, while the sum is 76.

The spelling of 66190917786097 in words is "sixty-six trillion, one hundred ninety billion, nine hundred seventeen million, seven hundred eighty-six thousand, ninety-seven".