126221277725 has 12 divisors (see below), whose sum is σ = 158718814560. Its totient is φ = 99554809200.

The previous prime is 126221277703. The next prime is 126221277733. The reversal of 126221277725 is 527772122621.

It is a happy number.

It is not a de Polignac number, because 126221277725 - 2¹⁶ = 126221212189 is a prime.

It is a hoax number, since the sum of its digits (44) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 35553515 + ... + 35557064.

It is an arithmetic number, because the mean of its divisors is an integer number (13226567880).

Almost surely, 2^126221277725 is an apocalyptic number.

It is an amenable number.

126221277725 is a deficient number, since it is larger than the sum of its proper divisors (32497536835).

126221277725 is an equidigital number, since it uses as much as digits as its factorization.

126221277725 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71110660 (or 71110655 counting only the distinct ones).

The product of its digits is 329280, while the sum is 44.

The spelling of 126221277725 in words is "one hundred twenty-six billion, two hundred twenty-one million, two hundred seventy-seven thousand, seven hundred twenty-five".