12541621751 has 4 divisors (see below), whose sum is σ = 12542261904. Its totient is φ = 12540981600.

The previous prime is 12541621721. The next prime is 12541621753. The reversal of 12541621751 is 15712614521.

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

It is a cyclic number.

It is not a de Polignac number, because 12541621751 - 2²² = 12537427447 is a prime.

It is a super-2 number, since 2×12541621751² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12541621753) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 289730 + ... + 330191.

It is an arithmetic number, because the mean of its divisors is an integer number (3135565476).

Almost surely, 2^12541621751 is an apocalyptic number.

12541621751 is a deficient number, since it is larger than the sum of its proper divisors (640153).

12541621751 is an equidigital number, since it uses as much as digits as its factorization.

12541621751 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 640152.

The product of its digits is 16800, while the sum is 35.

The spelling of 12541621751 in words is "twelve billion, five hundred forty-one million, six hundred twenty-one thousand, seven hundred fifty-one".