72566661 has 8 divisors (see below), whose sum is σ = 96934624. Its totient is φ = 48288240.

The previous prime is 72566609. The next prime is 72566707. The reversal of 72566661 is 16666527.

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

It is a de Polignac number, because none of the positive numbers 2^k-72566661 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 (72567661) 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, 20470 + ... + 23751.

It is an arithmetic number, because the mean of its divisors is an integer number (12116828).

Almost surely, 2^72566661 is an apocalyptic number.

It is an amenable number.

72566661 is a deficient number, since it is larger than the sum of its proper divisors (24367963).

72566661 is a wasteful number, since it uses less digits than its factorization.

72566661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44771.

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

The square root of 72566661 is about 8518.6067522806. The cubic root of 72566661 is about 417.1053049672.

The spelling of 72566661 in words is "seventy-two million, five hundred sixty-six thousand, six hundred sixty-one".