66432251 has 2 divisors, whose sum is σ = 66432252. Its totient is φ = 66432250.

The previous prime is 66432241. The next prime is 66432307. The reversal of 66432251 is 15223466.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 66432251 - 2¹⁸ = 66170107 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (66432221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33216125 + 33216126.

It is an arithmetic number, because the mean of its divisors is an integer number (33216126).

Almost surely, 2^66432251 is an apocalyptic number.

66432251 is a deficient number, since it is larger than the sum of its proper divisors (1).

66432251 is an equidigital number, since it uses as much as digits as its factorization.

66432251 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8640, while the sum is 29.

The square root of 66432251 is about 8150.5981989054. The cubic root of 66432251 is about 405.0043204335.

The spelling of 66432251 in words is "sixty-six million, four hundred thirty-two thousand, two hundred fifty-one".