164216541989 has 2 divisors, whose sum is σ = 164216541990. Its totient is φ = 164216541988.

The previous prime is 164216541943. The next prime is 164216542001. The reversal of 164216541989 is 989145612461.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 161033664100 + 3182877889 = 401290^2 + 56417^2 .

It is a cyclic number.

It is not a de Polignac number, because 164216541989 - 2³⁶ = 95497065253 is a prime.

It is a super-2 number, since 2×164216541989² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (164216541089) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82108270994 + 82108270995.

It is an arithmetic number, because the mean of its divisors is an integer number (82108270995).

Almost surely, 2^164216541989 is an apocalyptic number.

It is an amenable number.

164216541989 is a deficient number, since it is larger than the sum of its proper divisors (1).

164216541989 is an equidigital number, since it uses as much as digits as its factorization.

164216541989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3732480, while the sum is 56.

The spelling of 164216541989 in words is "one hundred sixty-four billion, two hundred sixteen million, five hundred forty-one thousand, nine hundred eighty-nine".