126556320105 has 40 divisors (see below), whose sum is σ = 232139859072. Its totient is φ = 65927004192.

The previous prime is 126556320101. The next prime is 126556320139. The reversal of 126556320105 is 501023655621.

126556320105 is a `hidden beast` number, since 1 + 2 + 6 + 5 + 5 + 632 + 0 + 10 + 5 = 666.

It is not a de Polignac number, because 126556320105 - 2² = 126556320101 is a prime.

It is a super-2 number, since 2×126556320105² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 126556320105.

It is not an unprimeable number, because it can be changed into a prime (126556320101) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 3616129 + ... + 3650958.

Almost surely, 2^126556320105 is an apocalyptic number.

126556320105 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

126556320105 is a deficient number, since it is larger than the sum of its proper divisors (105583538967).

126556320105 is an equidigital number, since it uses as much as digits as its factorization.

126556320105 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7267147 (or 7267138 counting only the distinct ones).

The product of its (nonzero) digits is 54000, while the sum is 36.

Adding to 126556320105 its reverse (501023655621), we get a palindrome (627579975726).

The spelling of 126556320105 in words is "one hundred twenty-six billion, five hundred fifty-six million, three hundred twenty thousand, one hundred five".