66416452663331 has 4 divisors (see below), whose sum is σ = 67074041303664. Its totient is φ = 65758864023000.

The previous prime is 66416452663291. The next prime is 66416452663361. The reversal of 66416452663331 is 13336625461466.

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

It is a cyclic number.

It is not a de Polignac number, because 66416452663331 - 2²² = 66416448469027 is a prime.

It is a super-2 number, since 2×66416452663331² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66416452663361) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 328794320015 + ... + 328794320216.

It is an arithmetic number, because the mean of its divisors is an integer number (16768510325916).

Almost surely, 2^{66416452663331} is an apocalyptic number.

66416452663331 is a deficient number, since it is larger than the sum of its proper divisors (657588640333).

66416452663331 is a wasteful number, since it uses less digits than its factorization.

66416452663331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 657588640332.

The product of its digits is 33592320, while the sum is 56.

The spelling of 66416452663331 in words is "sixty-six trillion, four hundred sixteen billion, four hundred fifty-two million, six hundred sixty-three thousand, three hundred thirty-one".