81080651782 has 32 divisors (see below), whose sum is σ = 132700696128. Its totient is φ = 36931683456.

The previous prime is 81080651761. The next prime is 81080651801. The reversal of 81080651782 is 28715608018.

It is a congruent number.

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, 732988 + ... + 836320.

It is an arithmetic number, because the mean of its divisors is an integer number (4146896754).

Almost surely, 2^81080651782 is an apocalyptic number.

81080651782 is a deficient number, since it is larger than the sum of its proper divisors (51620044346).

81080651782 is a wasteful number, since it uses less digits than its factorization.

81080651782 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 103744.

The product of its (nonzero) digits is 215040, while the sum is 46.

The spelling of 81080651782 in words is "eighty-one billion, eighty million, six hundred fifty-one thousand, seven hundred eighty-two".