81192777348 has 12 divisors (see below), whose sum is σ = 189449813840. Its totient is φ = 27064259112.

The previous prime is 81192777317. The next prime is 81192777353. The reversal of 81192777348 is 84377729118.

It is a tau number, because it is divible by the number of its divisors (12).

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, 3383032378 + ... + 3383032401.

Almost surely, 2^81192777348 is an apocalyptic number.

It is an amenable number.

81192777348 is an abundant number, since it is smaller than the sum of its proper divisors (108257036492).

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

81192777348 is a wasteful number, since it uses less digits than its factorization.

81192777348 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6766064786 (or 6766064784 counting only the distinct ones).

The product of its digits is 4741632, while the sum is 57.

The spelling of 81192777348 in words is "eighty-one billion, one hundred ninety-two million, seven hundred seventy-seven thousand, three hundred forty-eight".