809149542974 has 4 divisors (see below), whose sum is σ = 1213724314464. Its totient is φ = 404574771486.

The previous prime is 809149542967. The next prime is 809149542983. The reversal of 809149542974 is 479245941908.

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 (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 202287385742 + ... + 202287385745.

It is an arithmetic number, because the mean of its divisors is an integer number (303431078616).

Almost surely, 2^809149542974 is an apocalyptic number.

809149542974 is a deficient number, since it is larger than the sum of its proper divisors (404574771490).

809149542974 is a wasteful number, since it uses less digits than its factorization.

809149542974 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 404574771489.

The product of its (nonzero) digits is 26127360, while the sum is 62.

The spelling of 809149542974 in words is "eight hundred nine billion, one hundred forty-nine million, five hundred forty-two thousand, nine hundred seventy-four".