81253025996148 has 72 divisors (see below), whose sum is σ = 205494343244736. Its totient is φ = 27070530480000.

The previous prime is 81253025996111. The next prime is 81253025996161. The reversal of 81253025996148 is 84169952035218.

81253025996148 is a `hidden beast` number, since 8 + 1 + 2 + 5 + 3 + 0 + 2 + 5 + 9 + 9 + 614 + 8 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1931309953 + ... + 1931352023.

Almost surely, 2^{81253025996148} is an apocalyptic number.

It is an amenable number.

81253025996148 is an abundant number, since it is smaller than the sum of its proper divisors (124241317248588).

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

81253025996148 is a wasteful number, since it uses less digits than its factorization.

81253025996148 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68165 (or 68160 counting only the distinct ones).

The product of its (nonzero) digits is 37324800, while the sum is 63.

The spelling of 81253025996148 in words is "eighty-one trillion, two hundred fifty-three billion, twenty-five million, nine hundred ninety-six thousand, one hundred forty-eight".