66564377 has 4 divisors (see below), whose sum is σ = 72615696. Its totient is φ = 60513060.

The previous prime is 66564317. The next prime is 66564397. The reversal of 66564377 is 77346566.

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 66564377 - 2⁶ = 66564313 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (66564307) 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, 3025643 + ... + 3025664.

It is an arithmetic number, because the mean of its divisors is an integer number (18153924).

Almost surely, 2^66564377 is an apocalyptic number.

It is an amenable number.

66564377 is a deficient number, since it is larger than the sum of its proper divisors (6051319).

66564377 is a wasteful number, since it uses less digits than its factorization.

66564377 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6051318.

The product of its digits is 635040, while the sum is 44.

The square root of 66564377 is about 8158.6994674396. The cubic root of 66564377 is about 405.2726447442.

The spelling of 66564377 in words is "sixty-six million, five hundred sixty-four thousand, three hundred seventy-seven".