72166659 has 8 divisors (see below), whose sum is σ = 97074192. Its totient is φ = 47685120.

The previous prime is 72166657. The next prime is 72166673. The reversal of 72166659 is 95666127.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 72166659 - 2¹ = 72166657 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 72166659.

It is not an unprimeable number, because it can be changed into a prime (72166657) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 106102 + ... + 106779.

It is an arithmetic number, because the mean of its divisors is an integer number (12134274).

Almost surely, 2^72166659 is an apocalyptic number.

72166659 is a deficient number, since it is larger than the sum of its proper divisors (24907533).

72166659 is a wasteful number, since it uses less digits than its factorization.

72166659 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 212997.

The product of its digits is 136080, while the sum is 42.

The square root of 72166659 is about 8495.0961736757. The cubic root of 72166659 is about 416.3375030895.

The spelling of 72166659 in words is "seventy-two million, one hundred sixty-six thousand, six hundred fifty-nine".