66376685 has 4 divisors (see below), whose sum is σ = 79652028. Its totient is φ = 53101344.

The previous prime is 66376657. The next prime is 66376691. The reversal of 66376685 is 58667366.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 58667366 = 2 ⋅29333683.

It can be written as a sum of positive squares in 2 ways, for example, as 12823561 + 53553124 = 3581^2 + 7318^2 .

It is a cyclic number.

It is not a de Polignac number, because 66376685 - 2¹⁶ = 66311149 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6637664 + ... + 6637673.

It is an arithmetic number, because the mean of its divisors is an integer number (19913007).

Almost surely, 2^66376685 is an apocalyptic number.

It is an amenable number.

66376685 is a deficient number, since it is larger than the sum of its proper divisors (13275343).

66376685 is a wasteful number, since it uses less digits than its factorization.

66376685 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13275342.

The product of its digits is 1088640, while the sum is 47.

The square root of 66376685 is about 8147.1887789593. The cubic root of 66376685 is about 404.8913695343.

The spelling of 66376685 in words is "sixty-six million, three hundred seventy-six thousand, six hundred eighty-five".