12467731666 has 16 divisors (see below), whose sum is σ = 20242424664. Its totient is φ = 5725125504.

The previous prime is 12467731663. The next prime is 12467731669. The reversal of 12467731666 is 66613776421.

It is an interprime number because it is at equal distance from previous prime (12467731663) and next prime (12467731669).

It can be written as a sum of positive squares in 4 ways, for example, as 10093216225 + 2374515441 = 100465^2 + 48729^2 .

It is not an unprimeable number, because it can be changed into a prime (12467731663) 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, 1211955 + ... + 1222198.

Almost surely, 2^12467731666 is an apocalyptic number.

12467731666 is a deficient number, since it is larger than the sum of its proper divisors (7774692998).

12467731666 is a wasteful number, since it uses less digits than its factorization.

12467731666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2434365.

The product of its digits is 1524096, while the sum is 49.

The spelling of 12467731666 in words is "twelve billion, four hundred sixty-seven million, seven hundred thirty-one thousand, six hundred sixty-six".