66502291 has 2 divisors, whose sum is σ = 66502292. Its totient is φ = 66502290.

The previous prime is 66502277. The next prime is 66502301. The reversal of 66502291 is 19220566.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66502291 - 2²¹ = 64405139 is a prime.

It is not a weakly prime, because it can be changed into another prime (66502211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33251145 + 33251146.

It is an arithmetic number, because the mean of its divisors is an integer number (33251146).

Almost surely, 2^66502291 is an apocalyptic number.

66502291 is a deficient number, since it is larger than the sum of its proper divisors (1).

66502291 is an equidigital number, since it uses as much as digits as its factorization.

66502291 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6480, while the sum is 31.

The square root of 66502291 is about 8154.8936841629. The cubic root of 66502291 is about 405.1466034311.

The spelling of 66502291 in words is "sixty-six million, five hundred two thousand, two hundred ninety-one".