72166545 has 80 divisors (see below), whose sum is σ = 143434368. Its totient is φ = 34421760.

The previous prime is 72166489. The next prime is 72166553. The reversal of 72166545 is 54566127.

It is a happy number.

It is not a de Polignac number, because 72166545 - 2⁷ = 72166417 is a prime.

It is an unprimeable number.

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 79 ways as a sum of consecutive naturals, for example, 432052 + ... + 432218.

Almost surely, 2^72166545 is an apocalyptic number.

It is an amenable number.

72166545 is a deficient number, since it is larger than the sum of its proper divisors (71267823).

72166545 is a wasteful number, since it uses less digits than its factorization.

72166545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 292 (or 283 counting only the distinct ones).

The product of its digits is 50400, while the sum is 36.

The square root of 72166545 is about 8495.0894639197. The cubic root of 72166545 is about 416.3372838631.

The spelling of 72166545 in words is "seventy-two million, one hundred sixty-six thousand, five hundred forty-five".