66613766 has 8 divisors (see below), whose sum is σ = 102357864. Its totient is φ = 32494480.

The previous prime is 66613763. The next prime is 66613817. The reversal of 66613766 is 66731666.

It is a happy number.

66613766 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Harshad number since it is a multiple of its sum of digits (41).

It is a plaindrome in base 11.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66613763) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 406100 + ... + 406263.

It is an arithmetic number, because the mean of its divisors is an integer number (12794733).

Almost surely, 2^66613766 is an apocalyptic number.

66613766 is a deficient number, since it is larger than the sum of its proper divisors (35744098).

66613766 is a wasteful number, since it uses less digits than its factorization.

66613766 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 812406.

The product of its digits is 163296, while the sum is 41.

The square root of 66613766 is about 8161.7256753704. The cubic root of 66613766 is about 405.3728538107.

The spelling of 66613766 in words is "sixty-six million, six hundred thirteen thousand, seven hundred sixty-six".