80645543 has 4 divisors (see below), whose sum is σ = 87976968. Its totient is φ = 73314120.

The previous prime is 80645527. The next prime is 80645581. The reversal of 80645543 is 34554608.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 80645543 - 2⁴ = 80645527 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (80647543) 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, 3665696 + ... + 3665717.

It is an arithmetic number, because the mean of its divisors is an integer number (21994242).

Almost surely, 2^80645543 is an apocalyptic number.

80645543 is a deficient number, since it is larger than the sum of its proper divisors (7331425).

80645543 is a wasteful number, since it uses less digits than its factorization.

80645543 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7331424.

The product of its (nonzero) digits is 57600, while the sum is 35.

The square root of 80645543 is about 8980.2863540090. The cubic root of 80645543 is about 432.0428180439.

The spelling of 80645543 in words is "eighty million, six hundred forty-five thousand, five hundred forty-three".