126557137747 has 8 divisors (see below), whose sum is σ = 129240691200. Its totient is φ = 123891534984.

The previous prime is 126557137669. The next prime is 126557137799. The reversal of 126557137747 is 747731755621.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 126557137747 - 2¹⁹ = 126556613459 is a prime.

It is a super-2 number, since 2×126557137747² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (126557132747) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4473423 + ... + 4501624.

It is an arithmetic number, because the mean of its divisors is an integer number (16155086400).

Almost surely, 2^126557137747 is an apocalyptic number.

126557137747 is a deficient number, since it is larger than the sum of its proper divisors (2683553453).

126557137747 is an equidigital number, since it uses as much as digits as its factorization.

126557137747 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8975345.

The product of its digits is 8643600, while the sum is 55.

The spelling of 126557137747 in words is "one hundred twenty-six billion, five hundred fifty-seven million, one hundred thirty-seven thousand, seven hundred forty-seven".