81788316722 has 32 divisors (see below), whose sum is σ = 140560168320. Its totient is φ = 34964328960.

The previous prime is 81788316719. The next prime is 81788316749. The reversal of 81788316722 is 22761388718.

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, 13562804 + ... + 13568832.

It is an arithmetic number, because the mean of its divisors is an integer number (4392505260).

Almost surely, 2^81788316722 is an apocalyptic number.

81788316722 is a deficient number, since it is larger than the sum of its proper divisors (58771851598).

81788316722 is a wasteful number, since it uses less digits than its factorization.

81788316722 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8306.

The product of its digits is 1806336, while the sum is 53.

The spelling of 81788316722 in words is "eighty-one billion, seven hundred eighty-eight million, three hundred sixteen thousand, seven hundred twenty-two".