523680661 has 8 divisors (see below), whose sum is σ = 599225984. Its totient is φ = 448318800.

The previous prime is 523680623. The next prime is 523680667. The reversal of 523680661 is 166086325.

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

It is a cyclic number.

It is not a de Polignac number, because 523680661 - 2¹⁵ = 523647893 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 523680661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (523680667) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 39690 + ... + 51211.

It is an arithmetic number, because the mean of its divisors is an integer number (74903248).

Almost surely, 2^523680661 is an apocalyptic number.

It is an amenable number.

523680661 is a deficient number, since it is larger than the sum of its proper divisors (75545323).

523680661 is an equidigital number, since it uses as much as digits as its factorization.

523680661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 91731.

The product of its (nonzero) digits is 51840, while the sum is 37.

The square root of 523680661 is about 22884.0700269860. The cubic root of 523680661 is about 806.0379912802.

The spelling of 523680661 in words is "five hundred twenty-three million, six hundred eighty thousand, six hundred sixty-one".