12745598640 has 80 divisors (see below), whose sum is σ = 40159129056. Its totient is φ = 3343104000.

The previous prime is 12745598623. The next prime is 12745598647. The reversal of 12745598640 is 4689554721.

It is a tau number, because it is divible by the number of its divisors (80).

It is not an unprimeable number, because it can be changed into a prime (12745598647) by changing a digit.

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 in 15 ways as a sum of consecutive naturals, for example, 420661 + ... + 449940.

Almost surely, 2^12745598640 is an apocalyptic number.

12745598640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12745598640 is an abundant number, since it is smaller than the sum of its proper divisors (27413530416).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

12745598640 is a wasteful number, since it uses less digits than its factorization.

12745598640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 870678 (or 870672 counting only the distinct ones).

The product of its (nonzero) digits is 2419200, while the sum is 51.

The spelling of 12745598640 in words is "twelve billion, seven hundred forty-five million, five hundred ninety-eight thousand, six hundred forty".