126211906605 has 32 divisors (see below), whose sum is σ = 206272512000. Its totient is φ = 65869042752.

The previous prime is 126211906573. The next prime is 126211906621. The reversal of 126211906605 is 506609112621.

It is not a de Polignac number, because 126211906605 - 2⁵ = 126211906573 is a prime.

It is a congruent number.

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 31 ways as a sum of consecutive naturals, for example, 5076996 + ... + 5101794.

It is an arithmetic number, because the mean of its divisors is an integer number (6446016000).

Almost surely, 2^126211906605 is an apocalyptic number.

126211906605 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

126211906605 is a deficient number, since it is larger than the sum of its proper divisors (80060605395).

126211906605 is a wasteful number, since it uses less digits than its factorization.

126211906605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32073.

The product of its (nonzero) digits is 38880, while the sum is 39.

The spelling of 126211906605 in words is "one hundred twenty-six billion, two hundred eleven million, nine hundred six thousand, six hundred five".