781926378563 has 16 divisors (see below), whose sum is σ = 856372594176. Its totient is φ = 708041250240.

The previous prime is 781926378551. The next prime is 781926378599. The reversal of 781926378563 is 365873629187.

It is a cyclic number.

It is not a de Polignac number, because 781926378563 - 2⁴ = 781926378547 is a prime.

It is a super-2 number, since 2×781926378563² (a number of 25 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 781926378563.

It is not an unprimeable number, because it can be changed into a prime (781926378463) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 28242095 + ... + 28269767.

It is an arithmetic number, because the mean of its divisors is an integer number (53523287136).

Almost surely, 2^781926378563 is an apocalyptic number.

781926378563 is a deficient number, since it is larger than the sum of its proper divisors (74446215613).

781926378563 is a wasteful number, since it uses less digits than its factorization.

781926378563 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37714.

The product of its digits is 91445760, while the sum is 65.

The spelling of 781926378563 in words is "seven hundred eighty-one billion, nine hundred twenty-six million, three hundred seventy-eight thousand, five hundred sixty-three".