12640279973 has 2 divisors, whose sum is σ = 12640279974. Its totient is φ = 12640279972.

The previous prime is 12640279937. The next prime is 12640279999. The reversal of 12640279973 is 37997204621.

Together with previous prime (12640279937) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9907813444 + 2732466529 = 99538^2 + 52273^2 .

It is a cyclic number.

It is not a de Polignac number, because 12640279973 - 2¹² = 12640275877 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12640279903) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6320139986 + 6320139987.

It is an arithmetic number, because the mean of its divisors is an integer number (6320139987).

Almost surely, 2^12640279973 is an apocalyptic number.

It is an amenable number.

12640279973 is a deficient number, since it is larger than the sum of its proper divisors (1).

12640279973 is an equidigital number, since it uses as much as digits as its factorization.

12640279973 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1143072, while the sum is 50.

The spelling of 12640279973 in words is "twelve billion, six hundred forty million, two hundred seventy-nine thousand, nine hundred seventy-three".