81158983356 has 48 divisors (see below), whose sum is σ = 206935077888. Its totient is φ = 24552134400.

The previous prime is 81158983349. The next prime is 81158983393. The reversal of 81158983356 is 65338985118.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 81158983296 and 81158983305.

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, 440140 + ... + 596691.

It is an arithmetic number, because the mean of its divisors is an integer number (4311147456).

Almost surely, 2^81158983356 is an apocalyptic number.

It is an amenable number.

81158983356 is an abundant number, since it is smaller than the sum of its proper divisors (125776094532).

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

81158983356 is a wasteful number, since it uses less digits than its factorization.

81158983356 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1037442 (or 1037440 counting only the distinct ones).

The product of its digits is 6220800, while the sum is 57.

The spelling of 81158983356 in words is "eighty-one billion, one hundred fifty-eight million, nine hundred eighty-three thousand, three hundred fifty-six".