11725638506 has 4 divisors (see below), whose sum is σ = 17588457762. Its totient is φ = 5862819252.

The previous prime is 11725638479. The next prime is 11725638541. The reversal of 11725638506 is 60583652711.

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., 10649208025 + 1076430481 = 103195^2 + 32809^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2931409625 + ... + 2931409628.

Almost surely, 2^11725638506 is an apocalyptic number.

11725638506 is a deficient number, since it is larger than the sum of its proper divisors (5862819256).

11725638506 is an equidigital number, since it uses as much as digits as its factorization.

11725638506 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5862819255.

The product of its (nonzero) digits is 302400, while the sum is 44.

The spelling of 11725638506 in words is "eleven billion, seven hundred twenty-five million, six hundred thirty-eight thousand, five hundred six".