12661015603 has 2 divisors, whose sum is σ = 12661015604. Its totient is φ = 12661015602.

The previous prime is 12661015583. The next prime is 12661015639. The reversal of 12661015603 is 30651016621.

It is a weak prime.

It is an emirp because it is prime and its reverse (30651016621) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 12661015603 - 2³³ = 4071081011 is a prime.

It is not a weakly prime, because it can be changed into another prime (12661015673) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6330507801 + 6330507802.

It is an arithmetic number, because the mean of its divisors is an integer number (6330507802).

Almost surely, 2^12661015603 is an apocalyptic number.

12661015603 is a deficient number, since it is larger than the sum of its proper divisors (1).

12661015603 is an equidigital number, since it uses as much as digits as its factorization.

12661015603 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6480, while the sum is 31.

The spelling of 12661015603 in words is "twelve billion, six hundred sixty-one million, fifteen thousand, six hundred three".