81826533823204 has 27 divisors (see below), whose sum is σ = 152115814990587. Its totient is φ = 38506459419264.

The previous prime is 81826533823183. The next prime is 81826533823247. The reversal of 81826533823204 is 40232833562818.

The square root of 81826533823204 is 9045802.

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 21568575063204 + 60257958760000 = 4644198^2 + 7762600^2 .

It is a super-2 number, since 2×81826533823204² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 307424242 + ... + 307690294.

Almost surely, 2^{81826533823204} is an apocalyptic number.

81826533823204 is the 9045802-nd square number.

It is an amenable number.

81826533823204 is a deficient number, since it is larger than the sum of its proper divisors (70289281167383).

81826533823204 is an frugal number, since it uses more digits than its factorization.

81826533823204 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 532144 (or 266072 counting only the distinct ones).

The product of its (nonzero) digits is 13271040, while the sum is 55.

The spelling of 81826533823204 in words is "eighty-one trillion, eight hundred twenty-six billion, five hundred thirty-three million, eight hundred twenty-three thousand, two hundred four".