72166859 has 2 divisors, whose sum is σ = 72166860. Its totient is φ = 72166858.

The previous prime is 72166849. The next prime is 72166873. The reversal of 72166859 is 95866127.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 72166859 - 2⁸ = 72166603 is a prime.

It is a super-3 number, since 3×72166859³ (a number of 25 digits) contains 333 as substring.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (72166849) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36083429 + 36083430.

It is an arithmetic number, because the mean of its divisors is an integer number (36083430).

Almost surely, 2^72166859 is an apocalyptic number.

72166859 is a deficient number, since it is larger than the sum of its proper divisors (1).

72166859 is an equidigital number, since it uses as much as digits as its factorization.

72166859 is an evil number, because the sum of its binary digits is even.

The product of its digits is 181440, while the sum is 44.

The square root of 72166859 is about 8495.1079451647. The cubic root of 72166859 is about 416.3378876965.

The spelling of 72166859 in words is "seventy-two million, one hundred sixty-six thousand, eight hundred fifty-nine".