81501348705 has 16 divisors (see below), whose sum is σ = 149031037824. Its totient is φ = 37257759360.

The previous prime is 81501348697. The next prime is 81501348737. The reversal of 81501348705 is 50784310518.

It is not a de Polignac number, because 81501348705 - 2³ = 81501348697 is a prime.

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, 388101556 + ... + 388101765.

It is an arithmetic number, because the mean of its divisors is an integer number (9314439864).

Almost surely, 2^81501348705 is an apocalyptic number.

It is an amenable number.

81501348705 is a deficient number, since it is larger than the sum of its proper divisors (67529689119).

81501348705 is a wasteful number, since it uses less digits than its factorization.

81501348705 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 776203336.

The product of its (nonzero) digits is 134400, while the sum is 42.

The spelling of 81501348705 in words is "eighty-one billion, five hundred one million, three hundred forty-eight thousand, seven hundred five".