781009047673 has 4 divisors (see below), whose sum is σ = 781207731088. Its totient is φ = 780810364260.

The previous prime is 781009047667. The next prime is 781009047701. The reversal of 781009047673 is 376740900187.

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 781009047673 - 2⁵ = 781009047641 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 781009047673.

It is not an unprimeable number, because it can be changed into a prime (781009047473) 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, 99335811 + ... + 99343672.

It is an arithmetic number, because the mean of its divisors is an integer number (195301932772).

Almost surely, 2^781009047673 is an apocalyptic number.

It is an amenable number.

781009047673 is a deficient number, since it is larger than the sum of its proper divisors (198683415).

781009047673 is a wasteful number, since it uses less digits than its factorization.

781009047673 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 198683414.

The product of its (nonzero) digits is 1778112, while the sum is 52.

The spelling of 781009047673 in words is "seven hundred eighty-one billion, nine million, forty-seven thousand, six hundred seventy-three".