66166739 has 2 divisors, whose sum is σ = 66166740. Its totient is φ = 66166738.

The previous prime is 66166733. The next prime is 66166747. The reversal of 66166739 is 93766166.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 66166739 - 2⁸ = 66166483 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 66166739.

It is not a weakly prime, because it can be changed into another prime (66166733) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33083369 + 33083370.

It is an arithmetic number, because the mean of its divisors is an integer number (33083370).

Almost surely, 2^66166739 is an apocalyptic number.

66166739 is a deficient number, since it is larger than the sum of its proper divisors (1).

66166739 is an equidigital number, since it uses as much as digits as its factorization.

66166739 is an evil number, because the sum of its binary digits is even.

The product of its digits is 244944, while the sum is 44.

The square root of 66166739 is about 8134.2940074723. The cubic root of 66166739 is about 404.4640352288.

The spelling of 66166739 in words is "sixty-six million, one hundred sixty-six thousand, seven hundred thirty-nine".