781495073856 has 168 divisors, whose sum is σ = 2561444980224. Its totient is φ = 223159726080.

The previous prime is 781495073813. The next prime is 781495073873. The reversal of 781495073856 is 658370594187.

781495073856 is a `hidden beast` number, since 7 + 8 + 1 + 49 + 507 + 3 + 85 + 6 = 666.

It is a tau number, because it is divible by the number of its divisors (168).

It is a super-2 number, since 2×781495073856² (a number of 25 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a junction number, because it is equal to n+sod(n) for n = 781495073793 and 781495073802.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 7297176 + ... + 7403496.

Almost surely, 2^781495073856 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 781495073856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1280722490112).

781495073856 is an abundant number, since it is smaller than the sum of its proper divisors (1779949906368).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

781495073856 is a wasteful number, since it uses less digits than its factorization.

781495073856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 108169 (or 108156 counting only the distinct ones).

The product of its (nonzero) digits is 50803200, while the sum is 63.

The spelling of 781495073856 in words is "seven hundred eighty-one billion, four hundred ninety-five million, seventy-three thousand, eight hundred fifty-six".