66895091 has 4 divisors (see below), whose sum is σ = 67421952. Its totient is φ = 66368232.

The previous prime is 66895061. The next prime is 66895111. The reversal of 66895091 is 19059866.

66895091 is nontrivially palindromic in base 16.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66895091 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66895021) 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 in 3 ways as a sum of consecutive naturals, for example, 263240 + ... + 263493.

It is an arithmetic number, because the mean of its divisors is an integer number (16855488).

Almost surely, 2^66895091 is an apocalyptic number.

66895091 is a deficient number, since it is larger than the sum of its proper divisors (526861).

66895091 is a wasteful number, since it uses less digits than its factorization.

66895091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 526860.

The product of its (nonzero) digits is 116640, while the sum is 44.

The square root of 66895091 is about 8178.9419242345. The cubic root of 66895091 is about 405.9427127628.

It can be divided in two parts, 668 and 95091, that added together give a palindrome (95759).

The spelling of 66895091 in words is "sixty-six million, eight hundred ninety-five thousand, ninety-one".