164685761 has 2 divisors, whose sum is σ = 164685762. Its totient is φ = 164685760.

The previous prime is 164685757. The next prime is 164685767. The reversal of 164685761 is 167586461.

164685761 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 163047361 + 1638400 = 12769^2 + 1280^2 .

It is a cyclic number.

It is not a de Polignac number, because 164685761 - 2² = 164685757 is a prime.

It is a super-2 number, since 2×164685761² = 54242799752298242, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (164685767) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82342880 + 82342881.

It is an arithmetic number, because the mean of its divisors is an integer number (82342881).

Almost surely, 2^164685761 is an apocalyptic number.

It is an amenable number.

164685761 is a deficient number, since it is larger than the sum of its proper divisors (1).

164685761 is an equidigital number, since it uses as much as digits as its factorization.

164685761 is an evil number, because the sum of its binary digits is even.

The product of its digits is 241920, while the sum is 44.

The square root of 164685761 is about 12832.9950128565. The cubic root of 164685761 is about 548.1322440445.

The spelling of 164685761 in words is "one hundred sixty-four million, six hundred eighty-five thousand, seven hundred sixty-one".