12540423505 has 8 divisors (see below), whose sum is σ = 15455224872. Its totient is φ = 9761194368.

The previous prime is 12540423463. The next prime is 12540423517. The reversal of 12540423505 is 50532404521.

It can be written as a sum of positive squares in 4 ways, for example, as 4064827536 + 8475595969 = 63756^2 + 92063^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 12540423505 - 2¹⁹ = 12539899217 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 33892852 + ... + 33893221.

It is an arithmetic number, because the mean of its divisors is an integer number (1931903109).

Almost surely, 2^12540423505 is an apocalyptic number.

It is an amenable number.

12540423505 is a deficient number, since it is larger than the sum of its proper divisors (2914801367).

12540423505 is an equidigital number, since it uses as much as digits as its factorization.

12540423505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67786115.

The product of its (nonzero) digits is 24000, while the sum is 31.

The spelling of 12540423505 in words is "twelve billion, five hundred forty million, four hundred twenty-three thousand, five hundred five".