2081801694025 has 81 divisors (see below), whose sum is σ = 2702723493141. Its totient is φ = 1590684670080.

The previous prime is 2081801694017. The next prime is 2081801694053. The reversal of 2081801694025 is 5204961081802.

The square root of 2081801694025 is 1442845.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 11391506361 + 2070410187664 = 106731^2 + 1438892^2 .

It is not a de Polignac number, because 2081801694025 - 2³ = 2081801694017 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 80 ways as a sum of consecutive naturals, for example, 28517831389 + ... + 28517831461.

Almost surely, 2^{2081801694025} is an apocalyptic number.

2081801694025 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

2081801694025 is the 1442845-th square number.

2081801694025 is the 721423-rd centered octagonal number.

It is an amenable number.

2081801694025 is a deficient number, since it is larger than the sum of its proper divisors (620921799116).

2081801694025 is an frugal number, since it uses more digits than its factorization.

2081801694025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 408 (or 204 counting only the distinct ones).

The product of its (nonzero) digits is 276480, while the sum is 46.

The spelling of 2081801694025 in words is "two trillion, eighty-one billion, eight hundred one million, six hundred ninety-four thousand, twenty-five".