12467671561 has 4 divisors (see below), whose sum is σ = 12897591300. Its totient is φ = 12037751824.

The previous prime is 12467671547. The next prime is 12467671631. The reversal of 12467671561 is 16517676421.

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 1944810000 + 10522861561 = 44100^2 + 102581^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12467671561 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12467671261) 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, 214959826 + ... + 214959883.

It is an arithmetic number, because the mean of its divisors is an integer number (3224397825).

Almost surely, 2^12467671561 is an apocalyptic number.

It is an amenable number.

12467671561 is a deficient number, since it is larger than the sum of its proper divisors (429919739).

12467671561 is an equidigital number, since it uses as much as digits as its factorization.

12467671561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 429919738.

The product of its digits is 423360, while the sum is 46.

The spelling of 12467671561 in words is "twelve billion, four hundred sixty-seven million, six hundred seventy-one thousand, five hundred sixty-one".