81949982946 has 32 divisors (see below), whose sum is σ = 177796055808. Its totient is φ = 25031322240.

The previous prime is 81949982909. The next prime is 81949982977. The reversal of 81949982946 is 64928994918.

It is a Curzon 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, 3823770 + ... + 3845141.

It is an arithmetic number, because the mean of its divisors is an integer number (5556126744).

Almost surely, 2^81949982946 is an apocalyptic number.

81949982946 is an abundant number, since it is smaller than the sum of its proper divisors (95846072862).

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

81949982946 is a wasteful number, since it uses less digits than its factorization.

81949982946 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7669066.

The product of its digits is 80621568, while the sum is 69.

The spelling of 81949982946 in words is "eighty-one billion, nine hundred forty-nine million, nine hundred eighty-two thousand, nine hundred forty-six".