66491121 has 8 divisors (see below), whose sum is σ = 89439840. Its totient is φ = 43934912.

The previous prime is 66491107. The next prime is 66491147. The reversal of 66491121 is 12119466.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 66491121 - 2⁶ = 66491057 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (66491021) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 97731 + ... + 98408.

It is an arithmetic number, because the mean of its divisors is an integer number (11179980).

Almost surely, 2^66491121 is an apocalyptic number.

It is an amenable number.

66491121 is a deficient number, since it is larger than the sum of its proper divisors (22948719).

66491121 is a wasteful number, since it uses less digits than its factorization.

66491121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 196255.

The product of its digits is 2592, while the sum is 30.

The square root of 66491121 is about 8154.2087905572. The cubic root of 66491121 is about 405.1239187943.

The spelling of 66491121 in words is "sixty-six million, four hundred ninety-one thousand, one hundred twenty-one".