80478647857 has 4 divisors (see below), whose sum is σ = 80960556096. Its totient is φ = 79996739620.

The previous prime is 80478647827. The next prime is 80478647897. The reversal of 80478647857 is 75874687408.

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 80478647857 - 2²⁷ = 80344430129 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (80478647827) 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, 240953869 + ... + 240954202.

It is an arithmetic number, because the mean of its divisors is an integer number (20240139024).

Almost surely, 2^80478647857 is an apocalyptic number.

It is an amenable number.

80478647857 is a deficient number, since it is larger than the sum of its proper divisors (481908239).

80478647857 is a wasteful number, since it uses less digits than its factorization.

80478647857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 481908238.

The product of its (nonzero) digits is 84295680, while the sum is 64.

The spelling of 80478647857 in words is "eighty billion, four hundred seventy-eight million, six hundred forty-seven thousand, eight hundred fifty-seven".