12126291544 has 8 divisors (see below), whose sum is σ = 22736796660. Its totient is φ = 6063145768.

The previous prime is 12126291523. The next prime is 12126291637. The reversal of 12126291544 is 44519262121.

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×12126291544² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 757893214 + ... + 757893229.

Almost surely, 2^12126291544 is an apocalyptic number.

It is an amenable number.

12126291544 is a deficient number, since it is larger than the sum of its proper divisors (10610505116).

12126291544 is a wasteful number, since it uses less digits than its factorization.

12126291544 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1515786449 (or 1515786445 counting only the distinct ones).

The product of its digits is 34560, while the sum is 37.

The spelling of 12126291544 in words is "twelve billion, one hundred twenty-six million, two hundred ninety-one thousand, five hundred forty-four".