66161519 has 2 divisors, whose sum is σ = 66161520. Its totient is φ = 66161518.

The previous prime is 66161507. The next prime is 66161521. The reversal of 66161519 is 91516166.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66161519 - 2⁴ = 66161503 is a prime.

It is a super-2 number, since 2×66161519² = 8754693192774722, which contains 22 as substring.

It is a Sophie Germain prime.

Together with 66161521, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66164519) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33080759 + 33080760.

It is an arithmetic number, because the mean of its divisors is an integer number (33080760).

Almost surely, 2^66161519 is an apocalyptic number.

66161519 is a deficient number, since it is larger than the sum of its proper divisors (1).

66161519 is an equidigital number, since it uses as much as digits as its factorization.

66161519 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9720, while the sum is 35.

The square root of 66161519 is about 8133.9731374034. The cubic root of 66161519 is about 404.4533986772.

The spelling of 66161519 in words is "sixty-six million, one hundred sixty-one thousand, five hundred nineteen".