126725531571 has 6 divisors (see below), whose sum is σ = 183047990060. Its totient is φ = 84483687708.

The previous prime is 126725531557. The next prime is 126725531573. The reversal of 126725531571 is 175135527621.

126725531571 is a `hidden beast` number, since 1 + 2 + 6 + 7 + 25 + 53 + 1 + 571 = 666.

It is a de Polignac number, because none of the positive numbers 2^k-126725531571 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (126725531573) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 7040307301 + ... + 7040307318.

Almost surely, 2^126725531571 is an apocalyptic number.

126725531571 is a deficient number, since it is larger than the sum of its proper divisors (56322458489).

126725531571 is a wasteful number, since it uses less digits than its factorization.

126725531571 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14080614625 (or 14080614622 counting only the distinct ones).

The product of its digits is 441000, while the sum is 45.

The spelling of 126725531571 in words is "one hundred twenty-six billion, seven hundred twenty-five million, five hundred thirty-one thousand, five hundred seventy-one".