66081874 has 8 divisors (see below), whose sum is σ = 99203580. Its totient is φ = 33014016.

The previous prime is 66081871. The next prime is 66081881. The reversal of 66081874 is 47818066.

It can be written as a sum of positive squares in 2 ways, for example, as 65496649 + 585225 = 8093^2 + 765^2 .

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

It is not an unprimeable number, because it can be changed into a prime (66081871) 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, 10239 + ... + 15394.

Almost surely, 2^66081874 is an apocalyptic number.

66081874 is a deficient number, since it is larger than the sum of its proper divisors (33121706).

66081874 is a wasteful number, since it uses less digits than its factorization.

66081874 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26924.

The product of its (nonzero) digits is 64512, while the sum is 40.

The square root of 66081874 is about 8129.0758392329. The cubic root of 66081874 is about 404.2910403260.

The spelling of 66081874 in words is "sixty-six million, eighty-one thousand, eight hundred seventy-four".