126668881 has 4 divisors (see below), whose sum is σ = 127101492. Its totient is φ = 126236272.

The previous prime is 126668849. The next prime is 126668891. The reversal of 126668881 is 188866621.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 81993025 + 44675856 = 9055^2 + 6684^2 .

It is a cyclic number.

It is not a de Polignac number, because 126668881 - 2⁵ = 126668849 is a prime.

It is a super-2 number, since 2×126668881² = 32090010827584322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (126668891) 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, 215866 + ... + 216451.

It is an arithmetic number, because the mean of its divisors is an integer number (31775373).

Almost surely, 2^126668881 is an apocalyptic number.

It is an amenable number.

126668881 is a deficient number, since it is larger than the sum of its proper divisors (432611).

126668881 is an equidigital number, since it uses as much as digits as its factorization.

126668881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 432610.

The product of its digits is 221184, while the sum is 46.

The square root of 126668881 is about 11254.7270513327. The cubic root of 126668881 is about 502.2153446662.

The spelling of 126668881 in words is "one hundred twenty-six million, six hundred sixty-eight thousand, eight hundred eighty-one".