1500560666561 has 4 divisors (see below), whose sum is σ = 1636975272624. Its totient is φ = 1364146060500.

The previous prime is 1500560666531. The next prime is 1500560666617. The reversal of 1500560666561 is 1656660650051.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1500560666561 - 2⁶ = 1500560666497 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1500560666531) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 68207303015 + ... + 68207303036.

It is an arithmetic number, because the mean of its divisors is an integer number (409243818156).

Almost surely, 2^{1500560666561} is an apocalyptic number.

1500560666561 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1500560666561 is a deficient number, since it is larger than the sum of its proper divisors (136414606063).

1500560666561 is a wasteful number, since it uses less digits than its factorization.

1500560666561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 136414606062.

The product of its (nonzero) digits is 972000, while the sum is 47.

The spelling of 1500560666561 in words is "one trillion, five hundred billion, five hundred sixty million, six hundred sixty-six thousand, five hundred sixty-one".