80939256878 has 4 divisors (see below), whose sum is σ = 121408885320. Its totient is φ = 40469628438.

The previous prime is 80939256863. The next prime is 80939256883. The reversal of 80939256878 is 87865293908.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20234814218 + ... + 20234814221.

It is an arithmetic number, because the mean of its divisors is an integer number (30352221330).

Almost surely, 2^80939256878 is an apocalyptic number.

80939256878 is a deficient number, since it is larger than the sum of its proper divisors (40469628442).

80939256878 is a wasteful number, since it uses less digits than its factorization.

80939256878 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40469628441.

The product of its (nonzero) digits is 52254720, while the sum is 65.

The spelling of 80939256878 in words is "eighty billion, nine hundred thirty-nine million, two hundred fifty-six thousand, eight hundred seventy-eight".