66666874 has 16 divisors (see below), whose sum is σ = 101505960. Its totient is φ = 32834560.

The previous prime is 66666871. The next prime is 66666881. The reversal of 66666874 is 47866666.

It can be written as a sum of positive squares in 4 ways, for example, as 49914225 + 16752649 = 7065^2 + 4093^2 .

It is not an unprimeable number, because it can be changed into a prime (66666871) 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, 62304 + ... + 63364.

Almost surely, 2^66666874 is an apocalyptic number.

66666874 is a deficient number, since it is larger than the sum of its proper divisors (34839086).

66666874 is a wasteful number, since it uses less digits than its factorization.

66666874 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1505.

The product of its digits is 1741824, while the sum is 49.

The square root of 66666874 is about 8164.9785057892. The cubic root of 66666874 is about 405.4805533855.

The spelling of 66666874 in words is "sixty-six million, six hundred sixty-six thousand, eight hundred seventy-four".