126423320991 has 16 divisors (see below), whose sum is σ = 183904020480. Its totient is φ = 76613713920.

The previous prime is 126423320983. The next prime is 126423320993. The reversal of 126423320991 is 199023324621.

It is not a de Polignac number, because 126423320991 - 2³ = 126423320983 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (126423320993) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 249666 + ... + 561408.

It is an arithmetic number, because the mean of its divisors is an integer number (11494001280).

Almost surely, 2^126423320991 is an apocalyptic number.

126423320991 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

126423320991 is a deficient number, since it is larger than the sum of its proper divisors (57480699489).

126423320991 is a wasteful number, since it uses less digits than its factorization.

126423320991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 324046.

The product of its (nonzero) digits is 139968, while the sum is 42.

The spelling of 126423320991 in words is "one hundred twenty-six billion, four hundred twenty-three million, three hundred twenty thousand, nine hundred ninety-one".