164523661 has 2 divisors, whose sum is σ = 164523662. Its totient is φ = 164523660.

The previous prime is 164523631. The next prime is 164523673. The reversal of 164523661 is 166325461.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 163686436 + 837225 = 12794^2 + 915^2 .

It is a cyclic number.

It is not a de Polignac number, because 164523661 - 2⁵ = 164523629 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (164523631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82261830 + 82261831.

It is an arithmetic number, because the mean of its divisors is an integer number (82261831).

Almost surely, 2^164523661 is an apocalyptic number.

It is an amenable number.

164523661 is a deficient number, since it is larger than the sum of its proper divisors (1).

164523661 is an equidigital number, since it uses as much as digits as its factorization.

164523661 is an evil number, because the sum of its binary digits is even.

The product of its digits is 25920, while the sum is 34.

The square root of 164523661 is about 12826.6777070292. The cubic root of 164523661 is about 547.9523430327.

The spelling of 164523661 in words is "one hundred sixty-four million, five hundred twenty-three thousand, six hundred sixty-one".