72166573 has 4 divisors (see below), whose sum is σ = 73702080. Its totient is φ = 70631068.

The previous prime is 72166561. The next prime is 72166583. The reversal of 72166573 is 37566127.

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 72166573 - 2¹³ = 72158381 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72166553) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 767683 + ... + 767776.

It is an arithmetic number, because the mean of its divisors is an integer number (18425520).

Almost surely, 2^72166573 is an apocalyptic number.

It is an amenable number.

72166573 is a deficient number, since it is larger than the sum of its proper divisors (1535507).

72166573 is a wasteful number, since it uses less digits than its factorization.

72166573 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1535506.

The product of its digits is 52920, while the sum is 37.

The square root of 72166573 is about 8495.0911119305. The cubic root of 72166573 is about 416.3373377082.

The spelling of 72166573 in words is "seventy-two million, one hundred sixty-six thousand, five hundred seventy-three".