81678382325 has 12 divisors (see below), whose sum is σ = 107238911940. Its totient is φ = 61499016960.

The previous prime is 81678382297. The next prime is 81678382327. The reversal of 81678382325 is 52328387618.

It is a happy number.

It can be written as a sum of positive squares in 6 ways, for example, as 814360369 + 80864021956 = 28537^2 + 284366^2 .

It is not a de Polignac number, because 81678382325 - 2²⁶ = 81611273461 is a prime.

It is a hoax number, since the sum of its digits (53) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81678382327) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 96091790 + ... + 96092639.

It is an arithmetic number, because the mean of its divisors is an integer number (8936575995).

Almost surely, 2^81678382325 is an apocalyptic number.

81678382325 is a gapful number since it is divisible by the number (85) formed by its first and last digit.

It is an amenable number.

81678382325 is a deficient number, since it is larger than the sum of its proper divisors (25560529615).

81678382325 is a wasteful number, since it uses less digits than its factorization.

81678382325 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 192184456 (or 192184451 counting only the distinct ones).

The product of its digits is 3870720, while the sum is 53.

The spelling of 81678382325 in words is "eighty-one billion, six hundred seventy-eight million, three hundred eighty-two thousand, three hundred twenty-five".