11521759999 has 4 divisors (see below), whose sum is σ = 12128168440. Its totient is φ = 10915351560.

The previous prime is 11521759973. The next prime is 11521760027. The reversal of 11521759999 is 99995712511.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 99995712511 = 108421 ⋅922291.

It is a cyclic number.

It is not a de Polignac number, because 11521759999 - 2¹³ = 11521751807 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11521751999) 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 3 ways as a sum of consecutive naturals, for example, 303204192 + ... + 303204229.

It is an arithmetic number, because the mean of its divisors is an integer number (3032042110).

Almost surely, 2^11521759999 is an apocalyptic number.

11521759999 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

11521759999 is a deficient number, since it is larger than the sum of its proper divisors (606408441).

11521759999 is an equidigital number, since it uses as much as digits as its factorization.

11521759999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 606408440.

The product of its digits is 2296350, while the sum is 58.

The spelling of 11521759999 in words is "eleven billion, five hundred twenty-one million, seven hundred fifty-nine thousand, nine hundred ninety-nine".