6666104270921 has 2 divisors, whose sum is σ = 6666104270922. Its totient is φ = 6666104270920.

The previous prime is 6666104270807. The next prime is 6666104270941. The reversal of 6666104270921 is 1290724016666.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6578511949321 + 87592321600 = 2564861^2 + 295960^2 .

It is a cyclic number.

It is not a de Polignac number, because 6666104270921 - 2³⁴ = 6648924401737 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 6666104270921.

It is not a weakly prime, because it can be changed into another prime (6666104270941) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3333052135460 + 3333052135461.

It is an arithmetic number, because the mean of its divisors is an integer number (3333052135461).

Almost surely, 2^{6666104270921} is an apocalyptic number.

It is an amenable number.

6666104270921 is a deficient number, since it is larger than the sum of its proper divisors (1).

6666104270921 is an equidigital number, since it uses as much as digits as its factorization.

6666104270921 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1306368, while the sum is 50.

The spelling of 6666104270921 in words is "six trillion, six hundred sixty-six billion, one hundred four million, two hundred seventy thousand, nine hundred twenty-one".