126728424866 has 4 divisors (see below), whose sum is σ = 190092637302. Its totient is φ = 63364212432.

The previous prime is 126728424847. The next prime is 126728424929. The reversal of 126728424866 is 668424827621.

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

It can be written as a sum of positive squares in only one way, i.e., 121811470225 + 4916954641 = 349015^2 + 70121^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 31682106215 + ... + 31682106218.

Almost surely, 2^126728424866 is an apocalyptic number.

126728424866 is a deficient number, since it is larger than the sum of its proper divisors (63364212436).

126728424866 is an equidigital number, since it uses as much as digits as its factorization.

126728424866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63364212435.

The product of its digits is 12386304, while the sum is 56.

The spelling of 126728424866 in words is "one hundred twenty-six billion, seven hundred twenty-eight million, four hundred twenty-four thousand, eight hundred sixty-six".