163490026981 has 2 divisors, whose sum is σ = 163490026982. Its totient is φ = 163490026980.

The previous prime is 163490026979. The next prime is 163490027017. The reversal of 163490026981 is 189620094361.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 101521890625 + 61968136356 = 318625^2 + 248934^2 .

It is a cyclic number.

It is not a de Polignac number, because 163490026981 - 2¹ = 163490026979 is a prime.

It is a super-2 number, since 2×163490026981² (a number of 23 digits) contains 22 as substring.

Together with 163490026979, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (163490026181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 81745013490 + 81745013491.

It is an arithmetic number, because the mean of its divisors is an integer number (81745013491).

Almost surely, 2^163490026981 is an apocalyptic number.

It is an amenable number.

163490026981 is a deficient number, since it is larger than the sum of its proper divisors (1).

163490026981 is an equidigital number, since it uses as much as digits as its factorization.

163490026981 is an evil number, because the sum of its binary digits is even.

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

The spelling of 163490026981 in words is "one hundred sixty-three billion, four hundred ninety million, twenty-six thousand, nine hundred eighty-one".