126143815581 has 48 divisors (see below), whose sum is σ = 216442472064. Its totient is φ = 69288918912.

The previous prime is 126143815573. The next prime is 126143815597. The reversal of 126143815581 is 185518341621.

126143815581 is a `hidden beast` number, since 1 + 2 + 6 + 14 + 3 + 81 + 558 + 1 = 666.

It is not a de Polignac number, because 126143815581 - 2³ = 126143815573 is a prime.

It is a super-2 number, since 2×126143815581² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (126143815541) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 132526 + ... + 519471.

It is an arithmetic number, because the mean of its divisors is an integer number (4509218168).

Almost surely, 2^126143815581 is an apocalyptic number.

It is an amenable number.

126143815581 is a deficient number, since it is larger than the sum of its proper divisors (90298656483).

126143815581 is a wasteful number, since it uses less digits than its factorization.

126143815581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 652130 (or 652127 counting only the distinct ones).

The product of its digits is 230400, while the sum is 45.

The spelling of 126143815581 in words is "one hundred twenty-six billion, one hundred forty-three million, eight hundred fifteen thousand, five hundred eighty-one".