66254663 has 2 divisors, whose sum is σ = 66254664. Its totient is φ = 66254662.

The previous prime is 66254659. The next prime is 66254681. The reversal of 66254663 is 36645266.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 66254663 - 2² = 66254659 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66254623) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33127331 + 33127332.

It is an arithmetic number, because the mean of its divisors is an integer number (33127332).

Almost surely, 2^66254663 is an apocalyptic number.

66254663 is a deficient number, since it is larger than the sum of its proper divisors (1).

66254663 is an equidigital number, since it uses as much as digits as its factorization.

66254663 is an evil number, because the sum of its binary digits is even.

The product of its digits is 155520, while the sum is 38.

The square root of 66254663 is about 8139.6967388226. The cubic root of 66254663 is about 404.6431098719.

The spelling of 66254663 in words is "sixty-six million, two hundred fifty-four thousand, six hundred sixty-three".