12666537437 has 8 divisors (see below), whose sum is σ = 13673024640. Its totient is φ = 11698030960.

The previous prime is 12666537427. The next prime is 12666537479. The reversal of 12666537437 is 73473566621.

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

It is a cyclic number.

It is not a de Polignac number, because 12666537437 - 2¹⁰ = 12666536413 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12666537427) 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, 9494489 + ... + 9495822.

It is an arithmetic number, because the mean of its divisors is an integer number (1709128080).

Almost surely, 2^12666537437 is an apocalyptic number.

It is an amenable number.

12666537437 is a deficient number, since it is larger than the sum of its proper divisors (1006487203).

12666537437 is a wasteful number, since it uses less digits than its factorization.

12666537437 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18990363.

The product of its digits is 3810240, while the sum is 50.

The spelling of 12666537437 in words is "twelve billion, six hundred sixty-six million, five hundred thirty-seven thousand, four hundred thirty-seven".