164640671 has 8 divisors (see below), whose sum is σ = 181078464. Its totient is φ = 148741920.

The previous prime is 164640653. The next prime is 164640683. The reversal of 164640671 is 176046461.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 164640671 - 2¹⁸ = 164378527 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (164640691) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 134120 + ... + 135341.

It is an arithmetic number, because the mean of its divisors is an integer number (22634808).

Almost surely, 2^164640671 is an apocalyptic number.

164640671 is a deficient number, since it is larger than the sum of its proper divisors (16437793).

164640671 is a wasteful number, since it uses less digits than its factorization.

164640671 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 269521.

The product of its (nonzero) digits is 24192, while the sum is 35.

The square root of 164640671 is about 12831.2380930291. The cubic root of 164640671 is about 548.0822143420.

The spelling of 164640671 in words is "one hundred sixty-four million, six hundred forty thousand, six hundred seventy-one".