66054997 has 2 divisors, whose sum is σ = 66054998. Its totient is φ = 66054996.

The previous prime is 66054983. The next prime is 66055019. The reversal of 66054997 is 79945066.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 63345681 + 2709316 = 7959^2 + 1646^2 .

It is a cyclic number.

It is not a de Polignac number, because 66054997 - 2⁷ = 66054869 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66054797) 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, 33027498 + 33027499.

It is an arithmetic number, because the mean of its divisors is an integer number (33027499).

Almost surely, 2^66054997 is an apocalyptic number.

It is an amenable number.

66054997 is a deficient number, since it is larger than the sum of its proper divisors (1).

66054997 is an equidigital number, since it uses as much as digits as its factorization.

66054997 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 408240, while the sum is 46.

The square root of 66054997 is about 8127.4225311596. The cubic root of 66054997 is about 404.2362214418.

The spelling of 66054997 in words is "sixty-six million, fifty-four thousand, nine hundred ninety-seven".