66259091 has 4 divisors (see below), whose sum is σ = 66742872. Its totient is φ = 65775312.

The previous prime is 66259043. The next prime is 66259097. The reversal of 66259091 is 19095266.

66259091 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 66259091 - 2⁶ = 66259027 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66259097) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 241685 + ... + 241958.

It is an arithmetic number, because the mean of its divisors is an integer number (16685718).

Almost surely, 2^66259091 is an apocalyptic number.

66259091 is a deficient number, since it is larger than the sum of its proper divisors (483781).

66259091 is a wasteful number, since it uses less digits than its factorization.

66259091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 483780.

The product of its (nonzero) digits is 29160, while the sum is 38.

The square root of 66259091 is about 8139.9687345837. The cubic root of 66259091 is about 404.6521241797.

The spelling of 66259091 in words is "sixty-six million, two hundred fifty-nine thousand, ninety-one".