66356491 has 8 divisors (see below), whose sum is σ = 71974224. Its totient is φ = 60929280.

The previous prime is 66356473. The next prime is 66356501. The reversal of 66356491 is 19465366.

66356491 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 66356491 - 2⁹ = 66355979 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66356401) 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 7 ways as a sum of consecutive naturals, for example, 46905 + ... + 48298.

It is an arithmetic number, because the mean of its divisors is an integer number (8996778).

Almost surely, 2^66356491 is an apocalyptic number.

66356491 is a deficient number, since it is larger than the sum of its proper divisors (5617733).

66356491 is a wasteful number, since it uses less digits than its factorization.

66356491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 95261.

The product of its digits is 116640, while the sum is 40.

The square root of 66356491 is about 8145.9493614925. The cubic root of 66356491 is about 404.8503048862.

The spelling of 66356491 in words is "sixty-six million, three hundred fifty-six thousand, four hundred ninety-one".