126601437543 has 64 divisors (see below), whose sum is σ = 201159168000. Its totient is φ = 70773302880.

The previous prime is 126601437539. The next prime is 126601437593. The reversal of 126601437543 is 345734106621.

It is not a de Polignac number, because 126601437543 - 2² = 126601437539 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 126601437495 and 126601437504.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (126601437533) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 12805080 + ... + 12814962.

It is an arithmetic number, because the mean of its divisors is an integer number (3143112000).

Almost surely, 2^126601437543 is an apocalyptic number.

126601437543 is a deficient number, since it is larger than the sum of its proper divisors (74557730457).

126601437543 is an equidigital number, since it uses as much as digits as its factorization.

126601437543 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10177 (or 10163 counting only the distinct ones).

The product of its (nonzero) digits is 362880, while the sum is 42.

The spelling of 126601437543 in words is "one hundred twenty-six billion, six hundred one million, four hundred thirty-seven thousand, five hundred forty-three".