12258977281 has 4 divisors (see below), whose sum is σ = 12322495492. Its totient is φ = 12195459072.

The previous prime is 12258977261. The next prime is 12258977323. The reversal of 12258977281 is 18277985221.

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 8252087281 + 4006890000 = 90841^2 + 63300^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12258977281 is a prime.

It is a super-2 number, since 2×12258977281² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12258977201) 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, 31758816 + ... + 31759201.

It is an arithmetic number, because the mean of its divisors is an integer number (3080623873).

Almost surely, 2^12258977281 is an apocalyptic number.

It is an amenable number.

12258977281 is a deficient number, since it is larger than the sum of its proper divisors (63518211).

12258977281 is an equidigital number, since it uses as much as digits as its factorization.

12258977281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63518210.

The product of its digits is 1128960, while the sum is 52.

The spelling of 12258977281 in words is "twelve billion, two hundred fifty-eight million, nine hundred seventy-seven thousand, two hundred eighty-one".