66904049 has 2 divisors, whose sum is σ = 66904050. Its totient is φ = 66904048.

The previous prime is 66904031. The next prime is 66904051. The reversal of 66904049 is 94040966.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 64963600 + 1940449 = 8060^2 + 1393^2 .

It is a cyclic number.

It is not a de Polignac number, because 66904049 - 2²⁴ = 50126833 is a prime.

Together with 66904051, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (66904099) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33452024 + 33452025.

It is an arithmetic number, because the mean of its divisors is an integer number (33452025).

Almost surely, 2^66904049 is an apocalyptic number.

It is an amenable number.

66904049 is a deficient number, since it is larger than the sum of its proper divisors (1).

66904049 is an equidigital number, since it uses as much as digits as its factorization.

66904049 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 46656, while the sum is 38.

The square root of 66904049 is about 8179.4895317495. The cubic root of 66904049 is about 405.9608320421.

The spelling of 66904049 in words is "sixty-six million, nine hundred four thousand, forty-nine".