660565623 has 8 divisors (see below), whose sum is σ = 882683248. Its totient is φ = 439412544.

The previous prime is 660565621. The next prime is 660565627. The reversal of 660565623 is 326565066.

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

It is not a de Polignac number, because 660565623 - 2¹ = 660565621 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 (660565621) 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, 239536 + ... + 242277.

It is an arithmetic number, because the mean of its divisors is an integer number (110335406).

Almost surely, 2^660565623 is an apocalyptic number.

660565623 is a deficient number, since it is larger than the sum of its proper divisors (222117625).

660565623 is a wasteful number, since it uses less digits than its factorization.

660565623 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 482273.

The product of its (nonzero) digits is 194400, while the sum is 39.

The square root of 660565623 is about 25701.4712224806. The cubic root of 660565623 is about 870.9074176075.

The spelling of 660565623 in words is "six hundred sixty million, five hundred sixty-five thousand, six hundred twenty-three".