81344192425 has 6 divisors (see below), whose sum is σ = 100866798638. Its totient is φ = 65075353920.

The previous prime is 81344192407. The next prime is 81344192429. The reversal of 81344192425 is 52429144318.

It can be written as a sum of positive squares in 3 ways, for example, as 519976809 + 80824215616 = 22803^2 + 284296^2 .

It is not a de Polignac number, because 81344192425 - 2⁷ = 81344192297 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (81344192429) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1626883824 + ... + 1626883873.

Almost surely, 2^81344192425 is an apocalyptic number.

It is an amenable number.

81344192425 is a deficient number, since it is larger than the sum of its proper divisors (19522606213).

81344192425 is a wasteful number, since it uses less digits than its factorization.

81344192425 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3253767707 (or 3253767702 counting only the distinct ones).

The product of its digits is 276480, while the sum is 43.

The spelling of 81344192425 in words is "eighty-one billion, three hundred forty-four million, one hundred ninety-two thousand, four hundred twenty-five".