12355993771 has 24 divisors (see below), whose sum is σ = 14394279312. Its totient is φ = 10569630720.

The previous prime is 12355993693. The next prime is 12355993777. The reversal of 12355993771 is 17739955321.

It is not a de Polignac number, because 12355993771 - 2²¹ = 12353896619 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12355993777) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2735611 + ... + 2740123.

It is an arithmetic number, because the mean of its divisors is an integer number (599761638).

Almost surely, 2^12355993771 is an apocalyptic number.

12355993771 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

12355993771 is a deficient number, since it is larger than the sum of its proper divisors (2038285541).

12355993771 is an frugal number, since it uses more digits than its factorization.

12355993771 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4585 (or 4541 counting only the distinct ones).

The product of its digits is 1786050, while the sum is 52.

The spelling of 12355993771 in words is "twelve billion, three hundred fifty-five million, nine hundred ninety-three thousand, seven hundred seventy-one".