72166566 has 16 divisors (see below), whose sum is σ = 144419184. Its totient is φ = 24041184.

The previous prime is 72166561. The next prime is 72166583. The reversal of 72166566 is 66566127.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72166561) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13816 + ... + 18308.

It is an arithmetic number, because the mean of its divisors is an integer number (9026199).

Almost surely, 2^72166566 is an apocalyptic number.

72166566 is an abundant number, since it is smaller than the sum of its proper divisors (72252618).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

72166566 is a wasteful number, since it uses less digits than its factorization.

72166566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7175.

The product of its digits is 90720, while the sum is 39.

The square root of 72166566 is about 8495.0906999278. The cubic root of 72166566 is about 416.3373242469.

The spelling of 72166566 in words is "seventy-two million, one hundred sixty-six thousand, five hundred sixty-six".