126809457831 has 72 divisors (see below), whose sum is σ = 217345721424. Its totient is φ = 71018519040.

The previous prime is 126809457793. The next prime is 126809457889. The reversal of 126809457831 is 138754908621.

126809457831 is a `hidden beast` number, since 1 + 2 + 68 + 0 + 9 + 4 + 578 + 3 + 1 = 666.

It is not a de Polignac number, because 126809457831 - 2⁷ = 126809457703 is a prime.

It is a super-2 number, since 2×126809457831² (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 (126809457431) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 7604655 + ... + 7621311.

It is a 1-persistent number, because it is pandigital, but 2⋅126809457831 = 253618915662 is not.

Almost surely, 2^126809457831 is an apocalyptic number.

126809457831 is a deficient number, since it is larger than the sum of its proper divisors (90536263593).

126809457831 is a wasteful number, since it uses less digits than its factorization.

126809457831 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17021 (or 17011 counting only the distinct ones).

The product of its (nonzero) digits is 2903040, while the sum is 54.

The spelling of 126809457831 in words is "one hundred twenty-six billion, eight hundred nine million, four hundred fifty-seven thousand, eight hundred thirty-one".