281581683228216 has 96 divisors (see below), whose sum is σ = 899677267507200. Its totient is φ = 77856686602560.

The previous prime is 281581683228203. The next prime is 281581683228227. The reversal of 281581683228216 is 612822386185182.

281581683228216 is a `hidden beast` number, since 2 + 8 + 1 + 581 + 6 + 8 + 3 + 2 + 28 + 21 + 6 = 666.

It is a Smith number, since the sum of its digits (63) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (63).

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, 9011174956 + ... + 9011206203.

It is an arithmetic number, because the mean of its divisors is an integer number (9371638203200).

Almost surely, 2^{281581683228216} is an apocalyptic number.

It is an amenable number.

281581683228216 is an abundant number, since it is smaller than the sum of its proper divisors (618095584278984).

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

281581683228216 is a wasteful number, since it uses less digits than its factorization.

281581683228216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18022381209 (or 18022381202 counting only the distinct ones).

The product of its digits is 35389440, while the sum is 63.

The spelling of 281581683228216 in words is "two hundred eighty-one trillion, five hundred eighty-one billion, six hundred eighty-three million, two hundred twenty-eight thousand, two hundred sixteen".