66005443432564 has 24 divisors (see below), whose sum is σ = 122304495075840. Its totient is φ = 31061311222656.

The previous prime is 66005443432543. The next prime is 66005443432661. The reversal of 66005443432564 is 46523434450066.

It is a super-2 number, since 2×66005443432564² (a number of 28 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 36669229 + ... + 38427115.

It is an arithmetic number, because the mean of its divisors is an integer number (5096020628160).

Almost surely, 2^{66005443432564} is an apocalyptic number.

It is an amenable number.

66005443432564 is a deficient number, since it is larger than the sum of its proper divisors (56299051643276).

66005443432564 is a wasteful number, since it uses less digits than its factorization.

66005443432564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2310087 (or 2310085 counting only the distinct ones).

The product of its (nonzero) digits is 24883200, while the sum is 52.

The spelling of 66005443432564 in words is "sixty-six trillion, five billion, four hundred forty-three million, four hundred thirty-two thousand, five hundred sixty-four".