66681874 has 16 divisors (see below), whose sum is σ = 115492608. Its totient is φ = 28282752.

The previous prime is 66681847. The next prime is 66681883. The reversal of 66681874 is 47818666.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23194 + ... + 25909.

It is an arithmetic number, because the mean of its divisors is an integer number (7218288).

Almost surely, 2^66681874 is an apocalyptic number.

66681874 is a deficient number, since it is larger than the sum of its proper divisors (48810734).

66681874 is a wasteful number, since it uses less digits than its factorization.

66681874 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49209.

The product of its digits is 387072, while the sum is 46.

The square root of 66681874 is about 8165.8970113515. The cubic root of 66681874 is about 405.5109620519.

The spelling of 66681874 in words is "sixty-six million, six hundred eighty-one thousand, eight hundred seventy-four".