164996681 has 2 divisors, whose sum is σ = 164996682. Its totient is φ = 164996680.

The previous prime is 164996659. The next prime is 164996693. The reversal of 164996681 is 186699461.

164996681 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 150896656 + 14100025 = 12284^2 + 3755^2 .

It is a cyclic number.

It is not a de Polignac number, because 164996681 - 2¹⁰ = 164995657 is a prime.

It is a super-2 number, since 2×164996681² = 54447809482031522, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (164996621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82498340 + 82498341.

It is an arithmetic number, because the mean of its divisors is an integer number (82498341).

Almost surely, 2^164996681 is an apocalyptic number.

It is an amenable number.

164996681 is a deficient number, since it is larger than the sum of its proper divisors (1).

164996681 is an equidigital number, since it uses as much as digits as its factorization.

164996681 is an evil number, because the sum of its binary digits is even.

The product of its digits is 559872, while the sum is 50.

The square root of 164996681 is about 12845.1033861157. The cubic root of 164996681 is about 548.4769776281.

The spelling of 164996681 in words is "one hundred sixty-four million, nine hundred ninety-six thousand, six hundred eighty-one".