126781199905 has 16 divisors (see below), whose sum is σ = 155936983104. Its totient is φ = 98921908800.

The previous prime is 126781199899. The next prime is 126781199969. The reversal of 126781199905 is 509991187621.

It is not a de Polignac number, because 126781199905 - 2¹⁵ = 126781167137 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 126781199905.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1839687 + ... + 1907356.

It is an arithmetic number, because the mean of its divisors is an integer number (9746061444).

Almost surely, 2^126781199905 is an apocalyptic number.

It is an amenable number.

126781199905 is a deficient number, since it is larger than the sum of its proper divisors (29155783199).

126781199905 is a wasteful number, since it uses less digits than its factorization.

126781199905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3747216.

The product of its (nonzero) digits is 2449440, while the sum is 58.

The spelling of 126781199905 in words is "one hundred twenty-six billion, seven hundred eighty-one million, one hundred ninety-nine thousand, nine hundred five".