1720243154225 has 48 divisors (see below), whose sum is σ = 2191839499008. Its totient is φ = 1338678781440.

The previous prime is 1720243154221. The next prime is 1720243154233. The reversal of 1720243154225 is 5224513420271.

It is not a de Polignac number, because 1720243154225 - 2² = 1720243154221 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1720243154221) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 164564099 + ... + 164574551.

It is an arithmetic number, because the mean of its divisors is an integer number (45663322896).

Almost surely, 2^{1720243154225} is an apocalyptic number.

It is an amenable number.

1720243154225 is a deficient number, since it is larger than the sum of its proper divisors (471596344783).

1720243154225 is a wasteful number, since it uses less digits than its factorization.

1720243154225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11354 (or 11349 counting only the distinct ones).

The product of its (nonzero) digits is 134400, while the sum is 38.

Adding to 1720243154225 its reverse (5224513420271), we get a palindrome (6944756574496).

The spelling of 1720243154225 in words is "one trillion, seven hundred twenty billion, two hundred forty-three million, one hundred fifty-four thousand, two hundred twenty-five".