80644013649 has 24 divisors (see below), whose sum is σ = 127947792960. Its totient is φ = 48718577952.

The previous prime is 80644013623. The next prime is 80644013663. The reversal of 80644013649 is 94631044608.

It is not a de Polignac number, because 80644013649 - 2⁵ = 80644013617 is a prime.

It is a super-3 number, since 3×80644013649³ (a number of 34 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (80644013609) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 10248294 + ... + 10256159.

It is an arithmetic number, because the mean of its divisors is an integer number (5331158040).

Almost surely, 2^80644013649 is an apocalyptic number.

It is an amenable number.

80644013649 is a deficient number, since it is larger than the sum of its proper divisors (47303779311).

80644013649 is a wasteful number, since it uses less digits than its factorization.

80644013649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20504501 (or 20504498 counting only the distinct ones).

The product of its (nonzero) digits is 497664, while the sum is 45.

The spelling of 80644013649 in words is "eighty billion, six hundred forty-four million, thirteen thousand, six hundred forty-nine".