66767541193 has 2 divisors, whose sum is σ = 66767541194. Its totient is φ = 66767541192.

The previous prime is 66767541167. The next prime is 66767541229. The reversal of 66767541193 is 39114576766.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 61239916089 + 5527625104 = 247467^2 + 74348^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66767541193 is a prime.

It is not a weakly prime, because it can be changed into another prime (66767547193) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33383770596 + 33383770597.

It is an arithmetic number, because the mean of its divisors is an integer number (33383770597).

Almost surely, 2^66767541193 is an apocalyptic number.

It is an amenable number.

66767541193 is a deficient number, since it is larger than the sum of its proper divisors (1).

66767541193 is an equidigital number, since it uses as much as digits as its factorization.

66767541193 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5715360, while the sum is 55.

The spelling of 66767541193 in words is "sixty-six billion, seven hundred sixty-seven million, five hundred forty-one thousand, one hundred ninety-three".