12640051266 has 8 divisors (see below), whose sum is σ = 25280102544. Its totient is φ = 4213350420.

The previous prime is 12640051241. The next prime is 12640051349. The reversal of 12640051266 is 66215004621.

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

12640051266 is an admirable number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1053337600 + ... + 1053337611.

It is an arithmetic number, because the mean of its divisors is an integer number (3160012818).

Almost surely, 2^12640051266 is an apocalyptic number.

12640051266 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

12640051266 is a wasteful number, since it uses less digits than its factorization.

12640051266 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2106675216.

The product of its (nonzero) digits is 17280, while the sum is 33.

Adding to 12640051266 its reverse (66215004621), we get a palindrome (78855055887).

The spelling of 12640051266 in words is "twelve billion, six hundred forty million, fifty-one thousand, two hundred sixty-six".