66001384 has 8 divisors (see below), whose sum is σ = 123752610. Its totient is φ = 33000688.

The previous prime is 66001381. The next prime is 66001391. The reversal of 66001384 is 48310066.

It can be written as a sum of positive squares in only one way, i.e., 52969284 + 13032100 = 7278^2 + 3610^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a hoax number, since the sum of its digits (28) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (66001381) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4125079 + ... + 4125094.

Almost surely, 2^66001384 is an apocalyptic number.

It is an amenable number.

66001384 is a deficient number, since it is larger than the sum of its proper divisors (57751226).

66001384 is a wasteful number, since it uses less digits than its factorization.

66001384 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8250179 (or 8250175 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 28.

The square root of 66001384 is about 8124.1235835012. The cubic root of 66001384 is about 404.1268268284.

The spelling of 66001384 in words is "sixty-six million, one thousand, three hundred eighty-four".