1225985729648 has 30 divisors (see below), whose sum is σ = 2478666266664. Its totient is φ = 586330842592.

The previous prime is 1225985729629. The next prime is 1225985729669. The reversal of 1225985729648 is 8469275895221.

It is a congruent number.

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 in 5 ways as a sum of consecutive naturals, for example, 21211733 + ... + 21269451.

Almost surely, 2^{1225985729648} is an apocalyptic number.

It is an amenable number.

1225985729648 is an abundant number, since it is smaller than the sum of its proper divisors (1252680537016).

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

1225985729648 is an frugal number, since it uses more digits than its factorization.

1225985729648 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 115469 (or 57744 counting only the distinct ones).

The product of its digits is 174182400, while the sum is 68.

The spelling of 1225985729648 in words is "one trillion, two hundred twenty-five billion, nine hundred eighty-five million, seven hundred twenty-nine thousand, six hundred forty-eight".