12642766541 has 4 divisors (see below), whose sum is σ = 12984462972. Its totient is φ = 12301070112.

The previous prime is 12642766537. The next prime is 12642766553. The reversal of 12642766541 is 14566724621.

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

It can be written as a sum of positive squares in 2 ways, for example, as 7682522500 + 4960244041 = 87650^2 + 70429^2 .

It is a cyclic number.

It is not a de Polignac number, because 12642766541 - 2² = 12642766537 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12642766492 and 12642766501.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12642766571) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 170848160 + ... + 170848233.

It is an arithmetic number, because the mean of its divisors is an integer number (3246115743).

Almost surely, 2^12642766541 is an apocalyptic number.

It is an amenable number.

12642766541 is a deficient number, since it is larger than the sum of its proper divisors (341696431).

12642766541 is an equidigital number, since it uses as much as digits as its factorization.

12642766541 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 341696430.

The product of its digits is 483840, while the sum is 44.

The spelling of 12642766541 in words is "twelve billion, six hundred forty-two million, seven hundred sixty-six thousand, five hundred forty-one".