66011564 has 24 divisors (see below), whose sum is σ = 122206560. Its totient is φ = 31135104.

The previous prime is 66011563. The next prime is 66011581. The reversal of 66011564 is 46511066.

It is not an unprimeable number, because it can be changed into a prime (66011563) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1802 + ... + 11630.

It is an arithmetic number, because the mean of its divisors is an integer number (5091940).

Almost surely, 2^66011564 is an apocalyptic number.

It is an amenable number.

66011564 is a deficient number, since it is larger than the sum of its proper divisors (56194996).

66011564 is a wasteful number, since it uses less digits than its factorization.

66011564 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9929 (or 9927 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 29.

The square root of 66011564 is about 8124.7500884643. The cubic root of 66011564 is about 404.1476031584.

The spelling of 66011564 in words is "sixty-six million, eleven thousand, five hundred sixty-four".