164065631 has 4 divisors (see below), whose sum is σ = 164098200. Its totient is φ = 164033064.

The previous prime is 164065619. The next prime is 164065637. The reversal of 164065631 is 136560461.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 136560461 = 463 ⋅294947.

It is a cyclic number.

It is not a de Polignac number, because 164065631 - 2⁶ = 164065567 is a prime.

It is a super-2 number, since 2×164065631² = 53835062550856322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (164065637) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6941 + ... + 19398.

It is an arithmetic number, because the mean of its divisors is an integer number (41024550).

Almost surely, 2^164065631 is an apocalyptic number.

164065631 is a deficient number, since it is larger than the sum of its proper divisors (32569).

164065631 is an equidigital number, since it uses as much as digits as its factorization.

164065631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32568.

The product of its (nonzero) digits is 12960, while the sum is 32.

The square root of 164065631 is about 12808.8106785915. The cubic root of 164065631 is about 547.4433749462.

The spelling of 164065631 in words is "one hundred sixty-four million, sixty-five thousand, six hundred thirty-one".