164742647 has 4 divisors (see below), whose sum is σ = 165279576. Its totient is φ = 164205720.

The previous prime is 164742623. The next prime is 164742659. The reversal of 164742647 is 746247461.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 164742647 - 2²⁴ = 147965431 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 (164742607) 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, 268004 + ... + 268617.

It is an arithmetic number, because the mean of its divisors is an integer number (41319894).

Almost surely, 2^164742647 is an apocalyptic number.

164742647 is a deficient number, since it is larger than the sum of its proper divisors (536929).

164742647 is an equidigital number, since it uses as much as digits as its factorization.

164742647 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 536928.

The product of its digits is 225792, while the sum is 41.

The square root of 164742647 is about 12835.2112175842. The cubic root of 164742647 is about 548.1953489969.

The spelling of 164742647 in words is "one hundred sixty-four million, seven hundred forty-two thousand, six hundred forty-seven".