12547453381 has 4 divisors (see below), whose sum is σ = 13285538892. Its totient is φ = 11809367872.

The previous prime is 12547453351. The next prime is 12547453393. The reversal of 12547453381 is 18335474521.

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 11643489025 + 903964356 = 107905^2 + 30066^2 .

It is a cyclic number.

It is not a de Polignac number, because 12547453381 - 2¹⁷ = 12547322309 is a prime.

It is a super-2 number, since 2×12547453381² (a number of 21 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 (12547453351) 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, 369042730 + ... + 369042763.

It is an arithmetic number, because the mean of its divisors is an integer number (3321384723).

Almost surely, 2^12547453381 is an apocalyptic number.

It is an amenable number.

12547453381 is a deficient number, since it is larger than the sum of its proper divisors (738085511).

12547453381 is an equidigital number, since it uses as much as digits as its factorization.

12547453381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 738085510.

The product of its digits is 403200, while the sum is 43.

The spelling of 12547453381 in words is "twelve billion, five hundred forty-seven million, four hundred fifty-three thousand, three hundred eighty-one".