66854549 has 2 divisors, whose sum is σ = 66854550. Its totient is φ = 66854548.

The previous prime is 66854533. The next prime is 66854573. The reversal of 66854549 is 94545866.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 39627025 + 27227524 = 6295^2 + 5218^2 .

It is a cyclic number.

It is not a de Polignac number, because 66854549 - 2⁴ = 66854533 is a prime.

It is a Chen prime.

It is a congruent number.

It is a weakly prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33427274 + 33427275.

It is an arithmetic number, because the mean of its divisors is an integer number (33427275).

Almost surely, 2^66854549 is an apocalyptic number.

It is an amenable number.

66854549 is a deficient number, since it is larger than the sum of its proper divisors (1).

66854549 is an equidigital number, since it uses as much as digits as its factorization.

66854549 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1036800, while the sum is 47.

The square root of 66854549 is about 8176.4631106610. The cubic root of 66854549 is about 405.8606885311.

The spelling of 66854549 in words is "sixty-six million, eight hundred fifty-four thousand, five hundred forty-nine".