12356545381 has 2 divisors, whose sum is σ = 12356545382. Its totient is φ = 12356545380.

The previous prime is 12356545363. The next prime is 12356545441. The reversal of 12356545381 is 18354565321.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12283288900 + 73256481 = 110830^2 + 8559^2 .

It is a cyclic number.

It is not a de Polignac number, because 12356545381 - 2⁵ = 12356545349 is a prime.

It is a super-2 number, since 2×12356545381² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12356545181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6178272690 + 6178272691.

It is an arithmetic number, because the mean of its divisors is an integer number (6178272691).

Almost surely, 2^12356545381 is an apocalyptic number.

It is an amenable number.

12356545381 is a deficient number, since it is larger than the sum of its proper divisors (1).

12356545381 is an equidigital number, since it uses as much as digits as its factorization.

12356545381 is an evil number, because the sum of its binary digits is even.

The product of its digits is 432000, while the sum is 43.

The spelling of 12356545381 in words is "twelve billion, three hundred fifty-six million, five hundred forty-five thousand, three hundred eighty-one".