163172770091 has 2 divisors, whose sum is σ = 163172770092. Its totient is φ = 163172770090.

The previous prime is 163172770073. The next prime is 163172770121. The reversal of 163172770091 is 190077271361.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 163172770091 - 2⁶ = 163172770027 is a prime.

It is not a weakly prime, because it can be changed into another prime (163172770291) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 81586385045 + 81586385046.

It is an arithmetic number, because the mean of its divisors is an integer number (81586385046).

Almost surely, 2^163172770091 is an apocalyptic number.

163172770091 is a deficient number, since it is larger than the sum of its proper divisors (1).

163172770091 is an equidigital number, since it uses as much as digits as its factorization.

163172770091 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 111132, while the sum is 44.

The spelling of 163172770091 in words is "one hundred sixty-three billion, one hundred seventy-two million, seven hundred seventy thousand, ninety-one".