66841564 has 12 divisors (see below), whose sum is σ = 117150264. Its totient is φ = 33370064.

The previous prime is 66841561. The next prime is 66841589. The reversal of 66841564 is 46514866.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66841561) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9634 + ... + 15049.

It is an arithmetic number, because the mean of its divisors is an integer number (9762522).

Almost surely, 2^66841564 is an apocalyptic number.

It is an amenable number.

66841564 is a deficient number, since it is larger than the sum of its proper divisors (50308700).

66841564 is a wasteful number, since it uses less digits than its factorization.

66841564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25364 (or 25362 counting only the distinct ones).

The product of its digits is 138240, while the sum is 40.

The square root of 66841564 is about 8175.6690246120. The cubic root of 66841564 is about 405.8344103777.

The spelling of 66841564 in words is "sixty-six million, eight hundred forty-one thousand, five hundred sixty-four".