163490026891 has 2 divisors, whose sum is σ = 163490026892. Its totient is φ = 163490026890.

The previous prime is 163490026873. The next prime is 163490026933. The reversal of 163490026891 is 198620094361.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 163490026891 - 2¹⁵ = 163489994123 is a prime.

It is not a weakly prime, because it can be changed into another prime (163490026841) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 81745013445 + 81745013446.

It is an arithmetic number, because the mean of its divisors is an integer number (81745013446).

Almost surely, 2^163490026891 is an apocalyptic number.

163490026891 is a deficient number, since it is larger than the sum of its proper divisors (1).

163490026891 is an equidigital number, since it uses as much as digits as its factorization.

163490026891 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 559872, while the sum is 49.

The spelling of 163490026891 in words is "one hundred sixty-three billion, four hundred ninety million, twenty-six thousand, eight hundred ninety-one".