66650702189 has 2 divisors, whose sum is σ = 66650702190. Its totient is φ = 66650702188.

The previous prime is 66650702171. The next prime is 66650702249. The reversal of 66650702189 is 98120705666.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 52895400100 + 13755302089 = 229990^2 + 117283^2 .

It is a cyclic number.

It is not a de Polignac number, because 66650702189 - 2³² = 62355734893 is a prime.

It is a super-2 number, since 2×66650702189² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66650702389) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33325351094 + 33325351095.

It is an arithmetic number, because the mean of its divisors is an integer number (33325351095).

Almost surely, 2^66650702189 is an apocalyptic number.

It is an amenable number.

66650702189 is a deficient number, since it is larger than the sum of its proper divisors (1).

66650702189 is an equidigital number, since it uses as much as digits as its factorization.

66650702189 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1088640, while the sum is 50.

The spelling of 66650702189 in words is "sixty-six billion, six hundred fifty million, seven hundred two thousand, one hundred eighty-nine".