80944443649 has 4 divisors (see below), whose sum is σ = 80946303664. Its totient is φ = 80942583636.

The previous prime is 80944443647. The next prime is 80944443667. The reversal of 80944443649 is 94634444908.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 80944443649 - 2¹ = 80944443647 is a prime.

It is a super-2 number, since 2×80944443649² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 80944443649.

It is not an unprimeable number, because it can be changed into a prime (80944443641) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 863127 + ... + 952300.

It is an arithmetic number, because the mean of its divisors is an integer number (20236575916).

Almost surely, 2^80944443649 is an apocalyptic number.

It is an amenable number.

80944443649 is a deficient number, since it is larger than the sum of its proper divisors (1860015).

80944443649 is a wasteful number, since it uses less digits than its factorization.

80944443649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1860014.

The product of its (nonzero) digits is 11943936, while the sum is 55.

The spelling of 80944443649 in words is "eighty billion, nine hundred forty-four million, four hundred forty-three thousand, six hundred forty-nine".