126891055616 has 40 divisors (see below), whose sum is σ = 273036928164. Its totient is φ = 58565099520.

The previous prime is 126891055607. The next prime is 126891055639. The reversal of 126891055616 is 616550198621.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 126792966400 + 98089216 = 356080^2 + 9904^2 .

It is a super-2 number, since 2×126891055616² (a number of 23 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (50) coincides with the sum of the digits of its prime factors.

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 in 3 ways as a sum of consecutive naturals, for example, 9525425 + ... + 9538736.

Almost surely, 2^126891055616 is an apocalyptic number.

126891055616 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

126891055616 is an abundant number, since it is smaller than the sum of its proper divisors (146145872548).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

126891055616 is an equidigital number, since it uses as much as digits as its factorization.

126891055616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19064192 (or 19064176 counting only the distinct ones).

The product of its (nonzero) digits is 777600, while the sum is 50.

The spelling of 126891055616 in words is "one hundred twenty-six billion, eight hundred ninety-one million, fifty-five thousand, six hundred sixteen".