66377887 has 4 divisors (see below), whose sum is σ = 69871480. Its totient is φ = 62884296.

The previous prime is 66377881. The next prime is 66377923. The reversal of 66377887 is 78877366.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66377887 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66377881) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1746768 + ... + 1746805.

It is an arithmetic number, because the mean of its divisors is an integer number (17467870).

Almost surely, 2^66377887 is an apocalyptic number.

66377887 is a deficient number, since it is larger than the sum of its proper divisors (3493593).

66377887 is a wasteful number, since it uses less digits than its factorization.

66377887 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3493592.

The product of its digits is 2370816, while the sum is 52.

The square root of 66377887 is about 8147.2625464017. The cubic root of 66377887 is about 404.8938135475.

The spelling of 66377887 in words is "sixty-six million, three hundred seventy-seven thousand, eight hundred eighty-seven".