66877613 has 4 divisors (see below), whose sum is σ = 72957408. Its totient is φ = 60797820.

The previous prime is 66877589. The next prime is 66877619. The reversal of 66877613 is 31677866.

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 66877613 - 2⁸ = 66877357 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 (66877619) 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, 3039881 + ... + 3039902.

It is an arithmetic number, because the mean of its divisors is an integer number (18239352).

Almost surely, 2^66877613 is an apocalyptic number.

It is an amenable number.

66877613 is a deficient number, since it is larger than the sum of its proper divisors (6079795).

66877613 is a wasteful number, since it uses less digits than its factorization.

66877613 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6079794.

The product of its digits is 254016, while the sum is 44.

The square root of 66877613 is about 8177.8733788192. The cubic root of 66877613 is about 405.9073554860.

The spelling of 66877613 in words is "sixty-six million, eight hundred seventy-seven thousand, six hundred thirteen".