66011984 has 20 divisors (see below), whose sum is σ = 129167700. Its totient is φ = 32678400.

The previous prime is 66011941. The next prime is 66012031. The reversal of 66011984 is 48911066.

It can be written as a sum of positive squares in 2 ways, for example, as 55950400 + 10061584 = 7480^2 + 3172^2 .

It is a Smith number, since the sum of its digits (35) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18809 + ... + 22040.

It is an arithmetic number, because the mean of its divisors is an integer number (6458385).

Almost surely, 2^66011984 is an apocalyptic number.

It is an amenable number.

66011984 is a deficient number, since it is larger than the sum of its proper divisors (63155716).

66011984 is a wasteful number, since it uses less digits than its factorization.

66011984 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40958 (or 40952 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 35.

The square root of 66011984 is about 8124.7759353720. The cubic root of 66011984 is about 404.1484602892.

The spelling of 66011984 in words is "sixty-six million, eleven thousand, nine hundred eighty-four".