72165533 has 4 divisors (see below), whose sum is σ = 78726048. Its totient is φ = 65605020.

The previous prime is 72165523. The next prime is 72165547. The reversal of 72165533 is 33556127.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 72165533 - 2¹⁰ = 72164509 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 72165533.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72165523) 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, 3280241 + ... + 3280262.

It is an arithmetic number, because the mean of its divisors is an integer number (19681512).

Almost surely, 2^72165533 is an apocalyptic number.

It is an amenable number.

72165533 is a deficient number, since it is larger than the sum of its proper divisors (6560515).

72165533 is a wasteful number, since it uses less digits than its factorization.

72165533 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6560514.

The product of its digits is 18900, while the sum is 32.

The square root of 72165533 is about 8495.0298998885. The cubic root of 72165533 is about 416.3353377384.

The spelling of 72165533 in words is "seventy-two million, one hundred sixty-five thousand, five hundred thirty-three".