66900959 has 2 divisors, whose sum is σ = 66900960. Its totient is φ = 66900958.

The previous prime is 66900949. The next prime is 66900961. The reversal of 66900959 is 95900966.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66900959 - 2⁴ = 66900943 is a prime.

Together with 66900961, 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 (66900949) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33450479 + 33450480.

It is an arithmetic number, because the mean of its divisors is an integer number (33450480).

Almost surely, 2^66900959 is an apocalyptic number.

66900959 is a deficient number, since it is larger than the sum of its proper divisors (1).

66900959 is an equidigital number, since it uses as much as digits as its factorization.

66900959 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 131220, while the sum is 44.

The square root of 66900959 is about 8179.3006424755. The cubic root of 66900959 is about 405.9545821051.

The spelling of 66900959 in words is "sixty-six million, nine hundred thousand, nine hundred fifty-nine".