11566515523 has 2 divisors, whose sum is σ = 11566515524. Its totient is φ = 11566515522.

The previous prime is 11566515479. The next prime is 11566515533. The reversal of 11566515523 is 32551566511.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 11566515523 - 2¹⁷ = 11566384451 is a prime.

It is not a weakly prime, because it can be changed into another prime (11566515533) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5783257761 + 5783257762.

It is an arithmetic number, because the mean of its divisors is an integer number (5783257762).

Almost surely, 2^11566515523 is an apocalyptic number.

11566515523 is a deficient number, since it is larger than the sum of its proper divisors (1).

11566515523 is an equidigital number, since it uses as much as digits as its factorization.

11566515523 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 135000, while the sum is 40.

The spelling of 11566515523 in words is "eleven billion, five hundred sixty-six million, five hundred fifteen thousand, five hundred twenty-three".