164365643 has 4 divisors (see below), whose sum is σ = 177009168. Its totient is φ = 151722120.

The previous prime is 164365631. The next prime is 164365657. The reversal of 164365643 is 346563461.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 346563461 = 173 ⋅2003257.

It is a cyclic number.

It is not a de Polignac number, because 164365643 - 2⁸ = 164365387 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 164365597 and 164365606.

It is not an unprimeable number, because it can be changed into a prime (164365603) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6321743 + ... + 6321768.

It is an arithmetic number, because the mean of its divisors is an integer number (44252292).

Almost surely, 2^164365643 is an apocalyptic number.

164365643 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

164365643 is a deficient number, since it is larger than the sum of its proper divisors (12643525).

164365643 is a wasteful number, since it uses less digits than its factorization.

164365643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12643524.

The product of its digits is 155520, while the sum is 38.

The square root of 164365643 is about 12820.5164872559. The cubic root of 164365643 is about 547.7768585088.

The spelling of 164365643 in words is "one hundred sixty-four million, three hundred sixty-five thousand, six hundred forty-three".