12666537436 has 18 divisors (see below), whose sum is σ = 25785451608. Its totient is φ = 5428515960.

The previous prime is 12666537427. The next prime is 12666537479. The reversal of 12666537436 is 63473566621.

It is a Harshad number since it is a multiple of its sum of digits (49).

It is a self number, because there is not a number n which added to its sum of digits gives 12666537436.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 32312400 + ... + 32312791.

Almost surely, 2^12666537436 is an apocalyptic number.

It is an amenable number.

12666537436 is an abundant number, since it is smaller than the sum of its proper divisors (13118914172).

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

12666537436 is a wasteful number, since it uses less digits than its factorization.

12666537436 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64625209 (or 64625200 counting only the distinct ones).

The product of its digits is 3265920, while the sum is 49.

The spelling of 12666537436 in words is "twelve billion, six hundred sixty-six million, five hundred thirty-seven thousand, four hundred thirty-six".