73165643 has 4 divisors (see below), whose sum is σ = 73188240. Its totient is φ = 73143048.

The previous prime is 73165633. The next prime is 73165649. The reversal of 73165643 is 34656137.

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 73165643 - 2⁴ = 73165627 is a prime.

It is a super-2 number, since 2×73165643² = 10706422631206898, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (73165649) 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, 5423 + ... + 13256.

It is an arithmetic number, because the mean of its divisors is an integer number (18297060).

Almost surely, 2^73165643 is an apocalyptic number.

73165643 is a deficient number, since it is larger than the sum of its proper divisors (22597).

73165643 is a wasteful number, since it uses less digits than its factorization.

73165643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22596.

The product of its digits is 45360, while the sum is 35.

The square root of 73165643 is about 8553.6917760696. The cubic root of 73165643 is about 418.2497896516.

The spelling of 73165643 in words is "seventy-three million, one hundred sixty-five thousand, six hundred forty-three".