123660561 has 8 divisors (see below), whose sum is σ = 168715360. Its totient is φ = 80523072.

The previous prime is 123660557. The next prime is 123660571. The reversal of 123660561 is 165066321.

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

It is not a de Polignac number, because 123660561 - 2² = 123660557 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (123660571) 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, 479176 + ... + 479433.

It is an arithmetic number, because the mean of its divisors is an integer number (21089420).

Almost surely, 2^123660561 is an apocalyptic number.

It is an amenable number.

123660561 is a deficient number, since it is larger than the sum of its proper divisors (45054799).

123660561 is an equidigital number, since it uses as much as digits as its factorization.

123660561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 958655.

The product of its (nonzero) digits is 6480, while the sum is 30.

The square root of 123660561 is about 11120.2770199308. The cubic root of 123660561 is about 498.2076640743.

The spelling of 123660561 in words is "one hundred twenty-three million, six hundred sixty thousand, five hundred sixty-one".