81006707768 has 16 divisors (see below), whose sum is σ = 173585802480. Its totient is φ = 34717160448.

The previous prime is 81006707753. The next prime is 81006707777. The reversal of 81006707768 is 86770760018.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 723274121 + ... + 723274232.

It is an arithmetic number, because the mean of its divisors is an integer number (10849112655).

Almost surely, 2^81006707768 is an apocalyptic number.

It is an amenable number.

81006707768 is an abundant number, since it is smaller than the sum of its proper divisors (92579094712).

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

81006707768 is a wasteful number, since it uses less digits than its factorization.

81006707768 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1446548366 (or 1446548362 counting only the distinct ones).

The product of its (nonzero) digits is 790272, while the sum is 50.

The spelling of 81006707768 in words is "eighty-one billion, six million, seven hundred seven thousand, seven hundred sixty-eight".