164231555989 has 2 divisors, whose sum is σ = 164231555990. Its totient is φ = 164231555988.

The previous prime is 164231555977. The next prime is 164231556017. The reversal of 164231555989 is 989555132461.

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., 136185355089 + 28046200900 = 369033^2 + 167470^2 .

It is a cyclic number.

It is not a de Polignac number, because 164231555989 - 2¹⁵ = 164231523221 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (164231553989) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82115777994 + 82115777995.

It is an arithmetic number, because the mean of its divisors is an integer number (82115777995).

Almost surely, 2^164231555989 is an apocalyptic number.

It is an amenable number.

164231555989 is a deficient number, since it is larger than the sum of its proper divisors (1).

164231555989 is an equidigital number, since it uses as much as digits as its factorization.

164231555989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 11664000, while the sum is 58.

The spelling of 164231555989 in words is "one hundred sixty-four billion, two hundred thirty-one million, five hundred fifty-five thousand, nine hundred eighty-nine".