66877985 has 4 divisors (see below), whose sum is σ = 80253588. Its totient is φ = 53502384.

The previous prime is 66877969. The next prime is 66877991. The reversal of 66877985 is 58977866.

It is a happy number.

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 50239744 + 16638241 = 7088^2 + 4079^2 .

It is a cyclic number.

It is not a de Polignac number, because 66877985 - 2⁴ = 66877969 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 66877985.

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, 6687794 + ... + 6687803.

It is an arithmetic number, because the mean of its divisors is an integer number (20063397).

Almost surely, 2^66877985 is an apocalyptic number.

It is an amenable number.

66877985 is a deficient number, since it is larger than the sum of its proper divisors (13375603).

66877985 is a wasteful number, since it uses less digits than its factorization.

66877985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13375602.

The product of its digits is 5080320, while the sum is 56.

The square root of 66877985 is about 8177.8961230869. The cubic root of 66877985 is about 405.9081080909.

The spelling of 66877985 in words is "sixty-six million, eight hundred seventy-seven thousand, nine hundred eighty-five".