81898322120 has 64 divisors (see below), whose sum is σ = 195970596480. Its totient is φ = 30696426496.

The previous prime is 81898322119. The next prime is 81898322131. The reversal of 81898322120 is 2122389818.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 110924 + ... + 419643.

It is an arithmetic number, because the mean of its divisors is an integer number (3062040570).

Almost surely, 2^81898322120 is an apocalyptic number.

It is an amenable number.

81898322120 is an abundant number, since it is smaller than the sum of its proper divisors (114072274360).

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

81898322120 is a wasteful number, since it uses less digits than its factorization.

81898322120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 530822 (or 530818 counting only the distinct ones).

The product of its (nonzero) digits is 110592, while the sum is 44.

The spelling of 81898322120 in words is "eighty-one billion, eight hundred ninety-eight million, three hundred twenty-two thousand, one hundred twenty".