781734056816 has 20 divisors (see below), whose sum is σ = 1514895836592. Its totient is φ = 390793195776.

The previous prime is 781734056659. The next prime is 781734056861. The reversal of 781734056816 is 618650437187.

It is a super-2 number, since 2×781734056816² (a number of 25 digits) contains 22 as substring.

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 in 3 ways as a sum of consecutive naturals, for example, 4527140 + ... + 4696643.

Almost surely, 2^781734056816 is an apocalyptic number.

It is an amenable number.

781734056816 is a deficient number, since it is larger than the sum of its proper divisors (733161779776).

781734056816 is a wasteful number, since it uses less digits than its factorization.

781734056816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9229088 (or 9229082 counting only the distinct ones).

The product of its (nonzero) digits is 6773760, while the sum is 56.

The spelling of 781734056816 in words is "seven hundred eighty-one billion, seven hundred thirty-four million, fifty-six thousand, eight hundred sixteen".