66314581491 has 8 divisors (see below), whose sum is σ = 89739135424. Its totient is φ = 43549874280.

The previous prime is 66314581447. The next prime is 66314581499. The reversal of 66314581491 is 19418541366.

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

It is not a de Polignac number, because 66314581491 - 2⁹ = 66314580979 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 66314581491.

It is not an unprimeable number, because it can be changed into a prime (66314581499) 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, 164961445 + ... + 164961846.

It is an arithmetic number, because the mean of its divisors is an integer number (11217391928).

Almost surely, 2^66314581491 is an apocalyptic number.

66314581491 is a deficient number, since it is larger than the sum of its proper divisors (23424553933).

66314581491 is a wasteful number, since it uses less digits than its factorization.

66314581491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 329923361.

The product of its digits is 622080, while the sum is 48.

The spelling of 66314581491 in words is "sixty-six billion, three hundred fourteen million, five hundred eighty-one thousand, four hundred ninety-one".