66499157 has 2 divisors, whose sum is σ = 66499158. Its totient is φ = 66499156.

The previous prime is 66499127. The next prime is 66499163. The reversal of 66499157 is 75199466.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 60078001 + 6421156 = 7751^2 + 2534^2 .

It is a cyclic number.

It is not a de Polignac number, because 66499157 - 2⁶ = 66499093 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66499127) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33249578 + 33249579.

It is an arithmetic number, because the mean of its divisors is an integer number (33249579).

Almost surely, 2^66499157 is an apocalyptic number.

It is an amenable number.

66499157 is a deficient number, since it is larger than the sum of its proper divisors (1).

66499157 is an equidigital number, since it uses as much as digits as its factorization.

66499157 is an evil number, because the sum of its binary digits is even.

The product of its digits is 408240, while the sum is 47.

The square root of 66499157 is about 8154.7015273399. The cubic root of 66499157 is about 405.1402389918.

The spelling of 66499157 in words is "sixty-six million, four hundred ninety-nine thousand, one hundred fifty-seven".