1613511821225 has 6 divisors (see below), whose sum is σ = 2000754658350. Its totient is φ = 1290809456960.

The previous prime is 1613511821191. The next prime is 1613511821321. The reversal of 1613511821225 is 5221281153161.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 3232036201 + 1610279785024 = 56851^2 + 1268968^2 .

It is not a de Polignac number, because 1613511821225 - 2³⁴ = 1596331952041 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 32270236400 + ... + 32270236449.

It is an arithmetic number, because the mean of its divisors is an integer number (333459109725).

Almost surely, 2^{1613511821225} is an apocalyptic number.

It is an amenable number.

1613511821225 is a deficient number, since it is larger than the sum of its proper divisors (387242837125).

1613511821225 is an equidigital number, since it uses as much as digits as its factorization.

1613511821225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64540472859 (or 64540472854 counting only the distinct ones).

The product of its digits is 28800, while the sum is 38.

Adding to 1613511821225 its reverse (5221281153161), we get a palindrome (6834792974386).

The spelling of 1613511821225 in words is "one trillion, six hundred thirteen billion, five hundred eleven million, eight hundred twenty-one thousand, two hundred twenty-five".