66180739 has 2 divisors, whose sum is σ = 66180740. Its totient is φ = 66180738.

The previous prime is 66180731. The next prime is 66180761. The reversal of 66180739 is 93708166.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 66180739 - 2³ = 66180731 is a prime.

It is a super-2 number, since 2×66180739² = 8759780429172242, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (66180731) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33090369 + 33090370.

It is an arithmetic number, because the mean of its divisors is an integer number (33090370).

Almost surely, 2^66180739 is an apocalyptic number.

66180739 is a deficient number, since it is larger than the sum of its proper divisors (1).

66180739 is an equidigital number, since it uses as much as digits as its factorization.

66180739 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 54432, while the sum is 40.

The square root of 66180739 is about 8135.1545160495. The cubic root of 66180739 is about 404.4925596166.

The spelling of 66180739 in words is "sixty-six million, one hundred eighty thousand, seven hundred thirty-nine".