66896091 has 16 divisors (see below), whose sum is σ = 100302720. Its totient is φ = 44058600.

The previous prime is 66896033. The next prime is 66896143. The reversal of 66896091 is 19069866.

It is not a de Polignac number, because 66896091 - 2⁹ = 66895579 is a prime.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (66896021) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12685 + ... + 17166.

It is an arithmetic number, because the mean of its divisors is an integer number (6268920).

Almost surely, 2^66896091 is an apocalyptic number.

66896091 is a deficient number, since it is larger than the sum of its proper divisors (33406629).

66896091 is a wasteful number, since it uses less digits than its factorization.

66896091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29943 (or 29937 counting only the distinct ones).

The product of its (nonzero) digits is 139968, while the sum is 45.

The square root of 66896091 is about 8179.0030566078. The cubic root of 66896091 is about 405.9447355355.

The spelling of 66896091 in words is "sixty-six million, eight hundred ninety-six thousand, ninety-one".