66813862 has 16 divisors (see below), whose sum is σ = 101303280. Its totient is φ = 33048288.

The previous prime is 66813853. The next prime is 66813889. The reversal of 66813862 is 26831866.

It is a congruent 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, 121873 + ... + 122419.

It is an arithmetic number, because the mean of its divisors is an integer number (6331455).

Almost surely, 2^66813862 is an apocalyptic number.

66813862 is a deficient number, since it is larger than the sum of its proper divisors (34489418).

66813862 is a wasteful number, since it uses less digits than its factorization.

66813862 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1095.

The product of its digits is 82944, while the sum is 40.

The square root of 66813862 is about 8173.9746757621. The cubic root of 66813862 is about 405.7783375909.

The spelling of 66813862 in words is "sixty-six million, eight hundred thirteen thousand, eight hundred sixty-two".