80994244644 has 36 divisors (see below), whose sum is σ = 216778715244. Its totient is φ = 25409958912.

The previous prime is 80994244579. The next prime is 80994244657. The reversal of 80994244644 is 44644249908.

It can be written as a sum of positive squares in 2 ways, for example, as 76099843044 + 4894401600 = 275862^2 + 69960^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 66171157 + ... + 66172380.

It is an arithmetic number, because the mean of its divisors is an integer number (6021630979).

Almost surely, 2^80994244644 is an apocalyptic number.

It is an amenable number.

80994244644 is an abundant number, since it is smaller than the sum of its proper divisors (135784470600).

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

80994244644 is a wasteful number, since it uses less digits than its factorization.

80994244644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 132343564 (or 132343559 counting only the distinct ones).

The product of its (nonzero) digits is 7962624, while the sum is 54.

The spelling of 80994244644 in words is "eighty billion, nine hundred ninety-four million, two hundred forty-four thousand, six hundred forty-four".