66913384 has 8 divisors (see below), whose sum is σ = 125462610. Its totient is φ = 33456688.

The previous prime is 66913381. The next prime is 66913433. The reversal of 66913384 is 48331966.

66913384 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 only one way, i.e., 55502500 + 11410884 = 7450^2 + 3378^2 .

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

It is not an unprimeable number, because it can be changed into a prime (66913381) by changing a digit.

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 as a sum of consecutive naturals, namely, 4182079 + ... + 4182094.

Almost surely, 2^66913384 is an apocalyptic number.

It is an amenable number.

66913384 is a deficient number, since it is larger than the sum of its proper divisors (58549226).

66913384 is a wasteful number, since it uses less digits than its factorization.

66913384 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8364179 (or 8364175 counting only the distinct ones).

The product of its digits is 93312, while the sum is 40.

The square root of 66913384 is about 8180.0601464781. The cubic root of 66913384 is about 405.9797121557.

The spelling of 66913384 in words is "sixty-six million, nine hundred thirteen thousand, three hundred eighty-four".