126597738661 has 4 divisors (see below), whose sum is σ = 132101988192. Its totient is φ = 121093489132.

The previous prime is 126597738653. The next prime is 126597738721. The reversal of 126597738661 is 166837795621.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 126597738661 - 2³ = 126597738653 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 126597738661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (126597738601) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2752124731 + ... + 2752124776.

It is an arithmetic number, because the mean of its divisors is an integer number (33025497048).

Almost surely, 2^126597738661 is an apocalyptic number.

It is an amenable number.

126597738661 is a deficient number, since it is larger than the sum of its proper divisors (5504249531).

126597738661 is an equidigital number, since it uses as much as digits as its factorization.

126597738661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5504249530.

The product of its digits is 22861440, while the sum is 61.

The spelling of 126597738661 in words is "one hundred twenty-six billion, five hundred ninety-seven million, seven hundred thirty-eight thousand, six hundred sixty-one".