126013203506 has 4 divisors (see below), whose sum is σ = 189019805262. Its totient is φ = 63006601752.

The previous prime is 126013203497. The next prime is 126013203517. The reversal of 126013203506 is 605302310621.

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

It can be written as a sum of positive squares in only one way, i.e., 68008816225 + 58004387281 = 260785^2 + 240841^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 31503300875 + ... + 31503300878.

Almost surely, 2^126013203506 is an apocalyptic number.

126013203506 is a deficient number, since it is larger than the sum of its proper divisors (63006601756).

126013203506 is an equidigital number, since it uses as much as digits as its factorization.

126013203506 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63006601755.

The product of its (nonzero) digits is 6480, while the sum is 29.

The spelling of 126013203506 in words is "one hundred twenty-six billion, thirteen million, two hundred three thousand, five hundred six".