11989191551851 has 4 divisors (see below), whose sum is σ = 11991502058400. Its totient is φ = 11986881045304.

The previous prime is 11989191551849. The next prime is 11989191551881. The reversal of 11989191551851 is 15815519198911.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 11989191551851 - 2¹ = 11989191551849 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11989191551881) 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, 1155245491 + ... + 1155255868.

It is an arithmetic number, because the mean of its divisors is an integer number (2997875514600).

Almost surely, 2^{11989191551851} is an apocalyptic number.

11989191551851 is a deficient number, since it is larger than the sum of its proper divisors (2310506549).

11989191551851 is an equidigital number, since it uses as much as digits as its factorization.

11989191551851 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2310506548.

The product of its digits is 5832000, while the sum is 64.

The spelling of 11989191551851 in words is "eleven trillion, nine hundred eighty-nine billion, one hundred ninety-one million, five hundred fifty-one thousand, eight hundred fifty-one".