66467321921 has 32 divisors (see below), whose sum is σ = 89307042048. Its totient is φ = 47774269440.

The previous prime is 66467321909. The next prime is 66467321981. The reversal of 66467321921 is 12912376466.

66467321921 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 66467321921 - 2²² = 66463127617 is a prime.

It is a Smith number, since the sum of its digits (47) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (66467321981) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1411265 + ... + 1457601.

It is an arithmetic number, because the mean of its divisors is an integer number (2790845064).

Almost surely, 2^66467321921 is an apocalyptic number.

It is an amenable number.

66467321921 is a deficient number, since it is larger than the sum of its proper divisors (22839720127).

66467321921 is a wasteful number, since it uses less digits than its factorization.

66467321921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47801.

The product of its digits is 653184, while the sum is 47.

The spelling of 66467321921 in words is "sixty-six billion, four hundred sixty-seven million, three hundred twenty-one thousand, nine hundred twenty-one".