1225644550992 has 120 divisors (see below), whose sum is σ = 3461054478336. Its totient is φ = 404868941568.

The previous prime is 1225644550979. The next prime is 1225644550997. The reversal of 1225644550992 is 2990554465221.

1225644550992 is a `hidden beast` number, since 1 + 2 + 2 + 5 + 6 + 4 + 45 + 509 + 92 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1225644550997) 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, 16183678 + ... + 16259234.

Almost surely, 2^{1225644550992} is an apocalyptic number.

1225644550992 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1225644550992, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1730527239168).

1225644550992 is an abundant number, since it is smaller than the sum of its proper divisors (2235409927344).

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

1225644550992 is a wasteful number, since it uses less digits than its factorization.

1225644550992 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 76585 (or 76576 counting only the distinct ones).

The product of its (nonzero) digits is 7776000, while the sum is 54.

The spelling of 1225644550992 in words is "one trillion, two hundred twenty-five billion, six hundred forty-four million, five hundred fifty thousand, nine hundred ninety-two".