81803897360 has 80 divisors (see below), whose sum is σ = 190820036736. Its totient is φ = 32614078464.

The previous prime is 81803897353. The next prime is 81803897411. The reversal of 81803897360 is 6379830818.

It is a tau number, because it is divible by the number of its divisors (80).

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, 45879029 + ... + 45880811.

Almost surely, 2^81803897360 is an apocalyptic number.

81803897360 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

81803897360 is an abundant number, since it is smaller than the sum of its proper divisors (109016139376).

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

81803897360 is a wasteful number, since it uses less digits than its factorization.

81803897360 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3360 (or 3354 counting only the distinct ones).

The product of its (nonzero) digits is 1741824, while the sum is 53.

The spelling of 81803897360 in words is "eighty-one billion, eight hundred three million, eight hundred ninety-seven thousand, three hundred sixty".