164651605 has 8 divisors (see below), whose sum is σ = 198576000. Its totient is φ = 131058576.

The previous prime is 164651567. The next prime is 164651609. The reversal of 164651605 is 506156461.

It is a happy number.

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 164651605 - 2¹⁹ = 164127317 is a prime.

It is a super-2 number, since 2×164651605² = 54220302058152050, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (164651609) 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, 81745 + ... + 83734.

It is an arithmetic number, because the mean of its divisors is an integer number (24822000).

Almost surely, 2^164651605 is an apocalyptic number.

It is an amenable number.

164651605 is a deficient number, since it is larger than the sum of its proper divisors (33924395).

164651605 is a wasteful number, since it uses less digits than its factorization.

164651605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 165683.

The product of its (nonzero) digits is 21600, while the sum is 34.

The square root of 164651605 is about 12831.6641555178. The cubic root of 164651605 is about 548.0943470232.

The spelling of 164651605 in words is "one hundred sixty-four million, six hundred fifty-one thousand, six hundred five".