66025091 has 4 divisors (see below), whose sum is σ = 72027384. Its totient is φ = 60022800.

The previous prime is 66025073. The next prime is 66025097. The reversal of 66025091 is 19052066.

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 66025091 - 2⁶ = 66025027 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66025097) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3001130 + ... + 3001151.

It is an arithmetic number, because the mean of its divisors is an integer number (18006846).

Almost surely, 2^66025091 is an apocalyptic number.

66025091 is a deficient number, since it is larger than the sum of its proper divisors (6002293).

66025091 is a wasteful number, since it uses less digits than its factorization.

66025091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6002292.

The product of its (nonzero) digits is 3240, while the sum is 29.

The square root of 66025091 is about 8125.5825021964. The cubic root of 66025091 is about 404.1752070655.

The spelling of 66025091 in words is "sixty-six million, twenty-five thousand, ninety-one".