12509965450 has 48 divisors (see below), whose sum is σ = 23409852120. Its totient is φ = 4973696000.

The previous prime is 12509965441. The next prime is 12509965453. The reversal of 12509965450 is 5456990521.

It can be written as a sum of positive squares in 12 ways, for example, as 48038761 + 12461926689 = 6931^2 + 111633^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 12509965450.

It is not an unprimeable number, because it can be changed into a prime (12509965453) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 7319196 + ... + 7320904.

Almost surely, 2^12509965450 is an apocalyptic number.

12509965450 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

12509965450 is a deficient number, since it is larger than the sum of its proper divisors (10899886670).

12509965450 is a wasteful number, since it uses less digits than its factorization.

12509965450 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2523 (or 2518 counting only the distinct ones).

The product of its (nonzero) digits is 486000, while the sum is 46.

The spelling of 12509965450 in words is "twelve billion, five hundred nine million, nine hundred sixty-five thousand, four hundred fifty".