66646622660224 has 16 divisors (see below), whose sum is σ = 132772568581170. Its totient is φ = 33323311330048.

The previous prime is 66646622660153. The next prime is 66646622660243. The reversal of 66646622660224 is 42206622664666.

It can be written as a sum of positive squares in only one way, i.e., 62445270581824 + 4201352078400 = 7902232^2 + 2049720^2 .

It is a tau number, because it is divible by the number of its divisors (16).

It is a hoax number, since the sum of its digits (58) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 260338369639 + ... + 260338369894.

Almost surely, 2^{66646622660224} is an apocalyptic number.

66646622660224 is a gapful number since it is divisible by the number (64) formed by its first and last digit.

It is an amenable number.

66646622660224 is a deficient number, since it is larger than the sum of its proper divisors (66125945920946).

66646622660224 is an equidigital number, since it uses as much as digits as its factorization.

66646622660224 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 520676739547 (or 520676739535 counting only the distinct ones).

The product of its (nonzero) digits is 71663616, while the sum is 58.

The spelling of 66646622660224 in words is "sixty-six trillion, six hundred forty-six billion, six hundred twenty-two million, six hundred sixty thousand, two hundred twenty-four".