126709231357 has 4 divisors (see below), whose sum is σ = 126715891036. Its totient is φ = 126702571680.

The previous prime is 126709231343. The next prime is 126709231367. The reversal of 126709231357 is 753132907621.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 63698692996 + 63010538361 = 252386^2 + 251019^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-126709231357 is a prime.

It is a super-2 number, since 2×126709231357² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (126709231367) 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, 3301218 + ... + 3339379.

It is an arithmetic number, because the mean of its divisors is an integer number (31678972759).

Almost surely, 2^126709231357 is an apocalyptic number.

It is an amenable number.

126709231357 is a deficient number, since it is larger than the sum of its proper divisors (6659679).

126709231357 is an equidigital number, since it uses as much as digits as its factorization.

126709231357 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6659678.

The product of its (nonzero) digits is 476280, while the sum is 46.

The spelling of 126709231357 in words is "one hundred twenty-six billion, seven hundred nine million, two hundred thirty-one thousand, three hundred fifty-seven".