12537665707 has 4 divisors (see below), whose sum is σ = 14328760816. Its totient is φ = 10746570600.

The previous prime is 12537665663. The next prime is 12537665719. The reversal of 12537665707 is 70756673521.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12537665707 is a prime.

It is a super-2 number, since 2×12537665707² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12537665797) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 895547544 + ... + 895547557.

It is an arithmetic number, because the mean of its divisors is an integer number (3582190204).

Almost surely, 2^12537665707 is an apocalyptic number.

12537665707 is a deficient number, since it is larger than the sum of its proper divisors (1791095109).

12537665707 is an equidigital number, since it uses as much as digits as its factorization.

12537665707 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1791095108.

The product of its (nonzero) digits is 1852200, while the sum is 49.

The spelling of 12537665707 in words is "twelve billion, five hundred thirty-seven million, six hundred sixty-five thousand, seven hundred seven".