781045377863 has 4 divisors (see below), whose sum is σ = 781047488568. Its totient is φ = 781043267160.

The previous prime is 781045377857. The next prime is 781045377913. The reversal of 781045377863 is 368773540187.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-781045377863 is a prime.

It is a super-2 number, since 2×781045377863² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (781045377803) 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, 337556 + ... + 1294617.

It is an arithmetic number, because the mean of its divisors is an integer number (195261872142).

Almost surely, 2^781045377863 is an apocalyptic number.

781045377863 is a deficient number, since it is larger than the sum of its proper divisors (2110705).

781045377863 is a wasteful number, since it uses less digits than its factorization.

781045377863 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2110704.

The product of its (nonzero) digits is 23708160, while the sum is 59.

The spelling of 781045377863 in words is "seven hundred eighty-one billion, forty-five million, three hundred seventy-seven thousand, eight hundred sixty-three".