12666502401 has 24 divisors (see below), whose sum is σ = 19715982624. Its totient is φ = 7212219840.

The previous prime is 12666502393. The next prime is 12666502423. The reversal of 12666502401 is 10420566621.

It is not a de Polignac number, because 12666502401 - 2³ = 12666502393 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12666502451) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 112015 + ... + 194628.

It is an arithmetic number, because the mean of its divisors is an integer number (821499276).

Almost surely, 2^12666502401 is an apocalyptic number.

It is an amenable number.

12666502401 is a deficient number, since it is larger than the sum of its proper divisors (7049480223).

12666502401 is a wasteful number, since it uses less digits than its factorization.

12666502401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 306941 (or 306934 counting only the distinct ones).

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

The spelling of 12666502401 in words is "twelve billion, six hundred sixty-six million, five hundred two thousand, four hundred one".