12461643997 has 4 divisors (see below), whose sum is σ = 13594520736. Its totient is φ = 11328767260.

The previous prime is 12461643983. The next prime is 12461644031. The reversal of 12461643997 is 79934616421.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12461643997 is a prime.

It is a super-2 number, since 2×12461643997² (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 (12461643907) 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, 566438353 + ... + 566438374.

It is an arithmetic number, because the mean of its divisors is an integer number (3398630184).

Almost surely, 2^12461643997 is an apocalyptic number.

It is an amenable number.

12461643997 is a deficient number, since it is larger than the sum of its proper divisors (1132876739).

12461643997 is a wasteful number, since it uses less digits than its factorization.

12461643997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1132876738.

The product of its digits is 1959552, while the sum is 52.

The spelling of 12461643997 in words is "twelve billion, four hundred sixty-one million, six hundred forty-three thousand, nine hundred ninety-seven".