11891736239825 has 12 divisors (see below), whose sum is σ = 15880041625308. Its totient is φ = 8781589838400.

The previous prime is 11891736239797. The next prime is 11891736239827. The reversal of 11891736239825 is 52893263719811.

It can be written as a sum of positive squares in 6 ways, for example, as 1709619010576 + 10182117229249 = 1307524^2 + 3190943^2 .

It is not a de Polignac number, because 11891736239825 - 2¹⁰ = 11891736238801 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (65).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11891736239827) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 18294978506 + ... + 18294979155.

It is an arithmetic number, because the mean of its divisors is an integer number (1323336802109).

Almost surely, 2^{11891736239825} is an apocalyptic number.

It is an amenable number.

11891736239825 is a deficient number, since it is larger than the sum of its proper divisors (3988305385483).

11891736239825 is a wasteful number, since it uses less digits than its factorization.

11891736239825 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36589957684 (or 36589957679 counting only the distinct ones).

The product of its digits is 39191040, while the sum is 65.

The spelling of 11891736239825 in words is "eleven trillion, eight hundred ninety-one billion, seven hundred thirty-six million, two hundred thirty-nine thousand, eight hundred twenty-five".