66142885 has 4 divisors (see below), whose sum is σ = 79371468. Its totient is φ = 52914304.

The previous prime is 66142873. The next prime is 66142907. The reversal of 66142885 is 58824166.

66142885 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It can be written as a sum of positive squares in 2 ways, for example, as 32421636 + 33721249 = 5694^2 + 5807^2 .

It is a cyclic number.

It is not a de Polignac number, because 66142885 - 2²¹ = 64045733 is a prime.

It is a super-2 number, since 2×66142885² = 8749762472246450, which contains 22 as substring.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6614284 + ... + 6614293.

It is an arithmetic number, because the mean of its divisors is an integer number (19842867).

Almost surely, 2^66142885 is an apocalyptic number.

It is an amenable number.

66142885 is a deficient number, since it is larger than the sum of its proper divisors (13228583).

66142885 is a wasteful number, since it uses less digits than its factorization.

66142885 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13228582.

The product of its digits is 92160, while the sum is 40.

The square root of 66142885 is about 8132.8276140590. The cubic root of 66142885 is about 404.4154244771.

The spelling of 66142885 in words is "sixty-six million, one hundred forty-two thousand, eight hundred eighty-five".