126991117016 has 32 divisors (see below), whose sum is σ = 238640752800. Its totient is φ = 63353740800.

The previous prime is 126991117009. The next prime is 126991117021. The reversal of 126991117016 is 610711199621.

It is a super-2 number, since 2×126991117016² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

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 7 ways as a sum of consecutive naturals, for example, 7129850 + ... + 7147638.

It is an arithmetic number, because the mean of its divisors is an integer number (7457523525).

Almost surely, 2^126991117016 is an apocalyptic number.

It is an amenable number.

126991117016 is a deficient number, since it is larger than the sum of its proper divisors (111649635784).

126991117016 is a wasteful number, since it uses less digits than its factorization.

126991117016 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19739 (or 19735 counting only the distinct ones).

The product of its (nonzero) digits is 40824, while the sum is 44.

The spelling of 126991117016 in words is "one hundred twenty-six billion, nine hundred ninety-one million, one hundred seventeen thousand, sixteen".