66726565 has 8 divisors (see below), whose sum is σ = 83553408. Its totient is φ = 51060240.

The previous prime is 66726563. The next prime is 66726587. The reversal of 66726565 is 56562766.

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

It is not a de Polignac number, because 66726565 - 2¹ = 66726563 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 (66726563) 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, 290001 + ... + 290230.

It is an arithmetic number, because the mean of its divisors is an integer number (10444176).

Almost surely, 2^66726565 is an apocalyptic number.

It is an amenable number.

66726565 is a deficient number, since it is larger than the sum of its proper divisors (16826843).

66726565 is a wasteful number, since it uses less digits than its factorization.

66726565 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 580259.

The product of its digits is 453600, while the sum is 43.

The square root of 66726565 is about 8168.6329945714. The cubic root of 66726565 is about 405.6015346076.

The spelling of 66726565 in words is "sixty-six million, seven hundred twenty-six thousand, five hundred sixty-five".