12451225561 has 8 divisors (see below), whose sum is σ = 13314183624. Its totient is φ = 11602771200.

The previous prime is 12451225537. The next prime is 12451225601. The reversal of 12451225561 is 16552215421.

It can be written as a sum of positive squares in 4 ways, for example, as 3418623961 + 9032601600 = 58469^2 + 95040^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12451225561 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12451225861) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3624150 + ... + 3627583.

It is an arithmetic number, because the mean of its divisors is an integer number (1664272953).

Almost surely, 2^12451225561 is an apocalyptic number.

It is an amenable number.

12451225561 is a deficient number, since it is larger than the sum of its proper divisors (862958063).

12451225561 is a wasteful number, since it uses less digits than its factorization.

12451225561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7251851.

The product of its digits is 24000, while the sum is 34.

The spelling of 12451225561 in words is "twelve billion, four hundred fifty-one million, two hundred twenty-five thousand, five hundred sixty-one".