81275699952 has 30 divisors (see below), whose sum is σ = 227459077352. Its totient is φ = 27091899936.

The previous prime is 81275699929. The next prime is 81275700007. The reversal of 81275699952 is 25999657218.

81275699952 is a `hidden beast` number, since 8 + 12 + 7 + 569 + 9 + 9 + 52 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 81275699952.

It is a congruent number.

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 5 ways as a sum of consecutive naturals, for example, 282207148 + ... + 282207435.

Almost surely, 2^81275699952 is an apocalyptic number.

It is an amenable number.

81275699952 is an abundant number, since it is smaller than the sum of its proper divisors (146183377400).

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

81275699952 is a wasteful number, since it uses less digits than its factorization.

81275699952 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 564414597 (or 564414588 counting only the distinct ones).

The product of its digits is 24494400, while the sum is 63.

The spelling of 81275699952 in words is "eighty-one billion, two hundred seventy-five million, six hundred ninety-nine thousand, nine hundred fifty-two".