1225531233550 has 24 divisors (see below), whose sum is σ = 2454833333736. Its totient is φ = 452503839840.

The previous prime is 1225531233547. The next prime is 1225531233551. The reversal of 1225531233550 is 553321355221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1225531233551) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 942715684 + ... + 942716983.

It is an arithmetic number, because the mean of its divisors is an integer number (102284722239).

Almost surely, 2^{1225531233550} is an apocalyptic number.

1225531233550 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1225531233550 is an abundant number, since it is smaller than the sum of its proper divisors (1229302100186).

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

1225531233550 is a wasteful number, since it uses less digits than its factorization.

1225531233550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1885432692 (or 1885432687 counting only the distinct ones).

The product of its (nonzero) digits is 135000, while the sum is 37.

Adding to 1225531233550 its reverse (553321355221), we get a palindrome (1778852588771).

The spelling of 1225531233550 in words is "one trillion, two hundred twenty-five billion, five hundred thirty-one million, two hundred thirty-three thousand, five hundred fifty".