1225523311540 has 48 divisors (see below), whose sum is σ = 2807788604544. Its totient is φ = 445608950400.

The previous prime is 1225523311517. The next prime is 1225523311553. The reversal of 1225523311540 is 451133255221.

It is a junction number, because it is equal to n+sod(n) for n = 1225523311496 and 1225523311505.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2593897 + ... + 3029743.

It is an arithmetic number, because the mean of its divisors is an integer number (58495595928).

Almost surely, 2^{1225523311540} is an apocalyptic number.

1225523311540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1225523311540 is an abundant number, since it is smaller than the sum of its proper divisors (1582265293004).

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

1225523311540 is a wasteful number, since it uses less digits than its factorization.

1225523311540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 448648 (or 448646 counting only the distinct ones).

The product of its (nonzero) digits is 36000, while the sum is 34.

Adding to 1225523311540 its reverse (451133255221), we get a palindrome (1676656566761).

The spelling of 1225523311540 in words is "one trillion, two hundred twenty-five billion, five hundred twenty-three million, three hundred eleven thousand, five hundred forty".