81563705260 has 24 divisors (see below), whose sum is σ = 171289159776. Its totient is φ = 32624457600.

The previous prime is 81563705257. The next prime is 81563705273. The reversal of 81563705260 is 6250736518.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1152664 + ... + 1221376.

It is an arithmetic number, because the mean of its divisors is an integer number (7137048324).

Almost surely, 2^81563705260 is an apocalyptic number.

It is an amenable number.

81563705260 is an abundant number, since it is smaller than the sum of its proper divisors (89725454516).

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

81563705260 is a wasteful number, since it uses less digits than its factorization.

81563705260 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 128073 (or 128071 counting only the distinct ones).

The product of its (nonzero) digits is 302400, while the sum is 43.

The spelling of 81563705260 in words is "eighty-one billion, five hundred sixty-three million, seven hundred five thousand, two hundred sixty".