66724159 has 2 divisors, whose sum is σ = 66724160. Its totient is φ = 66724158.

The previous prime is 66724129. The next prime is 66724169. The reversal of 66724159 is 95142766.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66724159 - 2¹³ = 66715967 is a prime.

It is a super-2 number, since 2×66724159² = 8904226788514562, which contains 22 as substring.

It is a zygodrome in base 3.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66724109) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33362079 + 33362080.

It is an arithmetic number, because the mean of its divisors is an integer number (33362080).

Almost surely, 2^66724159 is an apocalyptic number.

66724159 is a deficient number, since it is larger than the sum of its proper divisors (1).

66724159 is an equidigital number, since it uses as much as digits as its factorization.

66724159 is an evil number, because the sum of its binary digits is even.

The product of its digits is 90720, while the sum is 40.

The square root of 66724159 is about 8168.4857225804. The cubic root of 66724159 is about 405.5966595426.

The spelling of 66724159 in words is "sixty-six million, seven hundred twenty-four thousand, one hundred fifty-nine".