11566560501 has 12 divisors (see below), whose sum is σ = 16872673740. Its totient is φ = 7634692800.

The previous prime is 11566560493. The next prime is 11566560539. The reversal of 11566560501 is 10506566511.

It can be written as a sum of positive squares in 2 ways, for example, as 7538754276 + 4027806225 = 86826^2 + 63465^2 .

It is not a de Polignac number, because 11566560501 - 2³ = 11566560493 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11566560101) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6361336 + ... + 6363153.

It is an arithmetic number, because the mean of its divisors is an integer number (1406056145).

Almost surely, 2^11566560501 is an apocalyptic number.

It is an amenable number.

11566560501 is a deficient number, since it is larger than the sum of its proper divisors (5306113239).

11566560501 is a wasteful number, since it uses less digits than its factorization.

11566560501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12724596 (or 12724593 counting only the distinct ones).

The product of its (nonzero) digits is 27000, while the sum is 36.

The spelling of 11566560501 in words is "eleven billion, five hundred sixty-six million, five hundred sixty thousand, five hundred one".