81925525293568 has 40 divisors (see below), whose sum is σ = 178572043425600. Its totient is φ = 37238875130880.

The previous prime is 81925525293461. The next prime is 81925525293571. The reversal of 81925525293568 is 86539252552918.

It is a junction number, because it is equal to n+sod(n) for n = 81925525293497 and 81925525293506.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 7273212168 + ... + 7273223431.

It is an arithmetic number, because the mean of its divisors is an integer number (4464301085640).

Almost surely, 2^{81925525293568} is an apocalyptic number.

81925525293568 is a gapful number since it is divisible by the number (88) formed by its first and last digit.

It is an amenable number.

81925525293568 is an abundant number, since it is smaller than the sum of its proper divisors (96646518132032).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

81925525293568 is a wasteful number, since it uses less digits than its factorization.

81925525293568 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14546435628 (or 14546435612 counting only the distinct ones).

The product of its digits is 466560000, while the sum is 70.

The spelling of 81925525293568 in words is "eighty-one trillion, nine hundred twenty-five billion, five hundred twenty-five million, two hundred ninety-three thousand, five hundred sixty-eight".