80644405537 has 8 divisors (see below), whose sum is σ = 85408394976. Its totient is φ = 75882660672.

The previous prime is 80644405421. The next prime is 80644405553. The reversal of 80644405537 is 73550444608.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 80644405537 - 2⁷ = 80644405409 is a prime.

It is a super-2 number, since 2×80644405537² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (80644405337) 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 7 ways as a sum of consecutive naturals, for example, 486883 + ... + 631144.

It is an arithmetic number, because the mean of its divisors is an integer number (10676049372).

Almost surely, 2^80644405537 is an apocalyptic number.

It is an amenable number.

80644405537 is a deficient number, since it is larger than the sum of its proper divisors (4763989439).

80644405537 is a wasteful number, since it uses less digits than its factorization.

80644405537 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1122287.

The product of its (nonzero) digits is 1612800, while the sum is 46.

The spelling of 80644405537 in words is "eighty billion, six hundred forty-four million, four hundred five thousand, five hundred thirty-seven".