126209266681 has 4 divisors (see below), whose sum is σ = 126306128512. Its totient is φ = 126112404852.

The previous prime is 126209266669. The next prime is 126209266751. The reversal of 126209266681 is 186662902621.

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-126209266681 is a prime.

It is a super-2 number, since 2×126209266681² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (126209266481) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 48428961 + ... + 48431566.

It is an arithmetic number, because the mean of its divisors is an integer number (31576532128).

Almost surely, 2^126209266681 is an apocalyptic number.

It is an amenable number.

126209266681 is a deficient number, since it is larger than the sum of its proper divisors (96861831).

126209266681 is an equidigital number, since it uses as much as digits as its factorization.

126209266681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 96861830.

The product of its (nonzero) digits is 746496, while the sum is 49.

The spelling of 126209266681 in words is "one hundred twenty-six billion, two hundred nine million, two hundred sixty-six thousand, six hundred eighty-one".