164893270921 has 2 divisors, whose sum is σ = 164893270922. Its totient is φ = 164893270920.

The previous prime is 164893270903. The next prime is 164893270961. The reversal of 164893270921 is 129072398461.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 161121960000 + 3771310921 = 401400^2 + 61411^2 .

It is an emirp because it is prime and its reverse (129072398461) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 164893270921 - 2⁵ = 164893270889 is a prime.

It is not a weakly prime, because it can be changed into another prime (164893270961) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82446635460 + 82446635461.

It is an arithmetic number, because the mean of its divisors is an integer number (82446635461).

Almost surely, 2^164893270921 is an apocalyptic number.

It is an amenable number.

164893270921 is a deficient number, since it is larger than the sum of its proper divisors (1).

164893270921 is an equidigital number, since it uses as much as digits as its factorization.

164893270921 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 52.

The spelling of 164893270921 in words is "one hundred sixty-four billion, eight hundred ninety-three million, two hundred seventy thousand, nine hundred twenty-one".