126537207073 has 4 divisors (see below), whose sum is σ = 126538078768. Its totient is φ = 126536335380.

The previous prime is 126537207037. The next prime is 126537207103. The reversal of 126537207073 is 370702735621.

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, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 370702735621 = 311 ⋅1191970211.

It is a cyclic number.

It is not a de Polignac number, because 126537207073 - 2⁹ = 126537206561 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (126537202073) 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, 159843 + ... + 527848.

It is an arithmetic number, because the mean of its divisors is an integer number (31634519692).

Almost surely, 2^126537207073 is an apocalyptic number.

It is an amenable number.

126537207073 is a deficient number, since it is larger than the sum of its proper divisors (871695).

126537207073 is an equidigital number, since it uses as much as digits as its factorization.

126537207073 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 871694.

The product of its (nonzero) digits is 370440, while the sum is 43.

The spelling of 126537207073 in words is "one hundred twenty-six billion, five hundred thirty-seven million, two hundred seven thousand, seventy-three".