1661062133225 has 18 divisors (see below), whose sum is σ = 2263986508350. Its totient is φ = 1208045185600.

The previous prime is 1661062133209. The next prime is 1661062133249. The reversal of 1661062133225 is 5223312601661.

It can be written as a sum of positive squares in 3 ways, for example, as 371958493456 + 1289103639769 = 609884^2 + 1135387^2 .

It is not a de Polignac number, because 1661062133225 - 2⁴ = 1661062133209 is a prime.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 274552700 + ... + 274558749.

Almost surely, 2^{1661062133225} is an apocalyptic number.

It is an amenable number.

1661062133225 is a deficient number, since it is larger than the sum of its proper divisors (602924375125).

1661062133225 is a wasteful number, since it uses less digits than its factorization.

1661062133225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 549111481 (or 549111465 counting only the distinct ones).

The product of its (nonzero) digits is 77760, while the sum is 38.

Adding to 1661062133225 its reverse (5223312601661), we get a palindrome (6884374734886).

The spelling of 1661062133225 in words is "one trillion, six hundred sixty-one billion, sixty-two million, one hundred thirty-three thousand, two hundred twenty-five".