164586638 has 4 divisors (see below), whose sum is σ = 246879960. Its totient is φ = 82293318.

The previous prime is 164586581. The next prime is 164586641. The reversal of 164586638 is 836685461.

164586638 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 836685461 = 13183 ⋅63467.

It is a super-2 number, since 2×164586638² = 54177522816286088, which contains 22 as substring.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 164586592 and 164586601.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41146658 + ... + 41146661.

It is an arithmetic number, because the mean of its divisors is an integer number (61719990).

Almost surely, 2^164586638 is an apocalyptic number.

164586638 is a deficient number, since it is larger than the sum of its proper divisors (82293322).

164586638 is an equidigital number, since it uses as much as digits as its factorization.

164586638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82293321.

The product of its digits is 829440, while the sum is 47.

The square root of 164586638 is about 12829.1323946711. The cubic root of 164586638 is about 548.0222498825.

The spelling of 164586638 in words is "one hundred sixty-four million, five hundred eighty-six thousand, six hundred thirty-eight".