81283254570 has 864 divisors, whose sum is σ = 282302931456. Its totient is φ = 16754169600.

The previous prime is 81283254553. The next prime is 81283254607. The reversal of 81283254570 is 7545238218.

81283254570 is a `hidden beast` number, since 8 + 1 + 2 + 8 + 32 + 545 + 70 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

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 431 ways as a sum of consecutive naturals, for example, 1332512340 + ... + 1332512400.

It is an arithmetic number, because the mean of its divisors is an integer number (326739504).

Almost surely, 2^81283254570 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 81283254570, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (141151465728).

81283254570 is an abundant number, since it is smaller than the sum of its proper divisors (201019676886).

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

81283254570 is a wasteful number, since it uses less digits than its factorization.

81283254570 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 166 (or 128 counting only the distinct ones).

The product of its (nonzero) digits is 537600, while the sum is 45.

The spelling of 81283254570 in words is "eighty-one billion, two hundred eighty-three million, two hundred fifty-four thousand, five hundred seventy".