781678355373334 has 16 divisors (see below), whose sum is σ = 1178997138577440. Its totient is φ = 388679315071680.

The previous prime is 781678355373257. The next prime is 781678355373341. The reversal of 781678355373334 is 433373553876187.

It is a super-2 number, since 2×781678355373334² (a number of 31 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 497457522 + ... + 499026394.

It is an arithmetic number, because the mean of its divisors is an integer number (73687321161090).

Almost surely, 2^{781678355373334} is an apocalyptic number.

781678355373334 is a deficient number, since it is larger than the sum of its proper divisors (397318783204106).

781678355373334 is a wasteful number, since it uses less digits than its factorization.

781678355373334 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2945415.

The product of its digits is 3200601600, while the sum is 73.

The spelling of 781678355373334 in words is "seven hundred eighty-one trillion, six hundred seventy-eight billion, three hundred fifty-five million, three hundred seventy-three thousand, three hundred thirty-four".