1216245435225 has 12 divisors (see below), whose sum is σ = 2010859119696. Its totient is φ = 648664232080.

The previous prime is 1216245435221. The next prime is 1216245435239. The reversal of 1216245435225 is 5225345426121.

It is not a de Polignac number, because 1216245435225 - 2² = 1216245435221 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1216245435221) 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, 8108302827 + ... + 8108302976.

It is an arithmetic number, because the mean of its divisors is an integer number (167571593308).

Almost surely, 2^{1216245435225} is an apocalyptic number.

1216245435225 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1216245435225 is a deficient number, since it is larger than the sum of its proper divisors (794613684471).

1216245435225 is a wasteful number, since it uses less digits than its factorization.

1216245435225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16216605816 (or 16216605811 counting only the distinct ones).

The product of its digits is 576000, while the sum is 42.

The spelling of 1216245435225 in words is "one trillion, two hundred sixteen billion, two hundred forty-five million, four hundred thirty-five thousand, two hundred twenty-five".