66111604 has 24 divisors (see below), whose sum is σ = 125332200. Its totient is φ = 30332544.

The previous prime is 66111599. The next prime is 66111631. The reversal of 66111604 is 40611166.

66111604 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 17139600 + 48972004 = 4140^2 + 6998^2 .

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 5322 + ... + 12670.

It is an arithmetic number, because the mean of its divisors is an integer number (5222175).

Almost surely, 2^66111604 is an apocalyptic number.

It is an amenable number.

66111604 is a deficient number, since it is larger than the sum of its proper divisors (59220596).

66111604 is a wasteful number, since it uses less digits than its factorization.

66111604 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7539 (or 7537 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 25.

The square root of 66111604 is about 8130.9042547554. The cubic root of 66111604 is about 404.3516609361.

The spelling of 66111604 in words is "sixty-six million, one hundred eleven thousand, six hundred four".