164640571 has 2 divisors, whose sum is σ = 164640572. Its totient is φ = 164640570.

The previous prime is 164640547. The next prime is 164640587. The reversal of 164640571 is 175046461.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 164640571 - 2¹³ = 164632379 is a prime.

It is not a weakly prime, because it can be changed into another prime (164640521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 82320285 + 82320286.

It is an arithmetic number, because the mean of its divisors is an integer number (82320286).

Almost surely, 2^164640571 is an apocalyptic number.

164640571 is a deficient number, since it is larger than the sum of its proper divisors (1).

164640571 is an equidigital number, since it uses as much as digits as its factorization.

164640571 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 20160, while the sum is 34.

The square root of 164640571 is about 12831.2341962884. The cubic root of 164640571 is about 548.0821033767.

The spelling of 164640571 in words is "one hundred sixty-four million, six hundred forty thousand, five hundred seventy-one".