164213685 has 12 divisors (see below), whose sum is σ = 284637132. Its totient is φ = 87580608.

The previous prime is 164213683. The next prime is 164213729. The reversal of 164213685 is 586312461.

It is a happy number.

164213685 is a `hidden beast` number, since 1 + 642 + 1 + 3 + 6 + 8 + 5 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 123343236 + 40870449 = 11106^2 + 6393^2 .

It is not a de Polignac number, because 164213685 - 2¹ = 164213683 is a prime.

It is a super-2 number, since 2×164213685² = 53932268682558450, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (164213681) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1824552 + ... + 1824641.

It is an arithmetic number, because the mean of its divisors is an integer number (23719761).

Almost surely, 2^164213685 is an apocalyptic number.

164213685 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

164213685 is a deficient number, since it is larger than the sum of its proper divisors (120423447).

164213685 is a wasteful number, since it uses less digits than its factorization.

164213685 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3649204 (or 3649201 counting only the distinct ones).

The product of its digits is 34560, while the sum is 36.

The square root of 164213685 is about 12814.5887565696. The cubic root of 164213685 is about 547.6079977108.

The spelling of 164213685 in words is "one hundred sixty-four million, two hundred thirteen thousand, six hundred eighty-five".