64166519 has 2 divisors, whose sum is σ = 64166520. Its totient is φ = 64166518.

The previous prime is 64166513. The next prime is 64166521. The reversal of 64166519 is 91566146.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-64166519 is a prime.

It is a super-2 number, since 2×64166519² = 8234684321154722, which contains 22 as substring.

Together with 64166521, 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 (64166513) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32083259 + 32083260.

It is an arithmetic number, because the mean of its divisors is an integer number (32083260).

Almost surely, 2^64166519 is an apocalyptic number.

64166519 is a deficient number, since it is larger than the sum of its proper divisors (1).

64166519 is an equidigital number, since it uses as much as digits as its factorization.

64166519 is an evil number, because the sum of its binary digits is even.

The product of its digits is 38880, while the sum is 38.

The square root of 64166519 is about 8010.4006766204. The cubic root of 64166519 is about 400.3466141432.

The spelling of 64166519 in words is "sixty-four million, one hundred sixty-six thousand, five hundred nineteen".