11955811805 has 16 divisors (see below), whose sum is σ = 16777858944. Its totient is φ = 8007612480.

The previous prime is 11955811771. The next prime is 11955811873. The reversal of 11955811805 is 50811855911.

It is not a de Polignac number, because 11955811805 - 2¹⁴ = 11955795421 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3970526 + ... + 3973535.

It is an arithmetic number, because the mean of its divisors is an integer number (1048616184).

Almost surely, 2^11955811805 is an apocalyptic number.

It is an amenable number.

11955811805 is a deficient number, since it is larger than the sum of its proper divisors (4822047139).

11955811805 is an equidigital number, since it uses as much as digits as its factorization.

11955811805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7944116.

The product of its (nonzero) digits is 72000, while the sum is 44.

The spelling of 11955811805 in words is "eleven billion, nine hundred fifty-five million, eight hundred eleven thousand, eight hundred five".