1661831395325 has 12 divisors (see below), whose sum is σ = 2078906959668. Its totient is φ = 1317699936000.

The previous prime is 1661831395319. The next prime is 1661831395373. The reversal of 1661831395325 is 5235931381661.

It is a happy number.

It can be written as a sum of positive squares in 6 ways, for example, as 242404583716 + 1419426811609 = 492346^2 + 1191397^2 .

It is not a de Polignac number, because 1661831395325 - 2¹⁸ = 1661831133181 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 294126626 + ... + 294132275.

It is an arithmetic number, because the mean of its divisors is an integer number (173242246639).

Almost surely, 2^{1661831395325} is an apocalyptic number.

It is an amenable number.

1661831395325 is a deficient number, since it is larger than the sum of its proper divisors (417075564343).

1661831395325 is a wasteful number, since it uses less digits than its factorization.

1661831395325 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 588259024 (or 588259019 counting only the distinct ones).

The product of its digits is 3499200, while the sum is 53.

The spelling of 1661831395325 in words is "one trillion, six hundred sixty-one billion, eight hundred thirty-one million, three hundred ninety-five thousand, three hundred twenty-five".