12356887216381 has 4 divisors (see below), whose sum is σ = 12439819345500. Its totient is φ = 12273955087264.

The previous prime is 12356887216363. The next prime is 12356887216397. The reversal of 12356887216381 is 18361278865321.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 2073769923481 + 10283117292900 = 1440059^2 + 3206730^2 .

It is a cyclic number.

It is not a de Polignac number, because 12356887216381 - 2¹³ = 12356887208189 is a prime.

It is a super-2 number, since 2×12356887216381² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12356887216301) 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, 41466064336 + ... + 41466064633.

It is an arithmetic number, because the mean of its divisors is an integer number (3109954836375).

Almost surely, 2^{12356887216381} is an apocalyptic number.

It is an amenable number.

12356887216381 is a deficient number, since it is larger than the sum of its proper divisors (82932129119).

12356887216381 is an equidigital number, since it uses as much as digits as its factorization.

12356887216381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82932129118.

The product of its digits is 23224320, while the sum is 61.

The spelling of 12356887216381 in words is "twelve trillion, three hundred fifty-six billion, eight hundred eighty-seven million, two hundred sixteen thousand, three hundred eighty-one".