66377917 has 4 divisors (see below), whose sum is σ = 66460576. Its totient is φ = 66295260.

The previous prime is 66377881. The next prime is 66377923. The reversal of 66377917 is 71977366.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 66377917 - 2¹⁹ = 65853629 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 (66375917) 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, 40113 + ... + 41734.

It is an arithmetic number, because the mean of its divisors is an integer number (16615144).

Almost surely, 2^66377917 is an apocalyptic number.

It is an amenable number.

66377917 is a deficient number, since it is larger than the sum of its proper divisors (82659).

66377917 is an equidigital number, since it uses as much as digits as its factorization.

66377917 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82658.

The product of its digits is 333396, while the sum is 46.

The square root of 66377917 is about 8147.2643875107. The cubic root of 66377917 is about 404.8938745458.

The spelling of 66377917 in words is "sixty-six million, three hundred seventy-seven thousand, nine hundred seventeen".