726907781663 has 12 divisors (see below), whose sum is σ = 845809167240. Its totient is φ = 622899818352.

The previous prime is 726907781647. The next prime is 726907781683. The reversal of 726907781663 is 366187709627.

It is not a de Polignac number, because 726907781663 - 2⁴ = 726907781647 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 726907781596 and 726907781605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (726907781623) 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 11 ways as a sum of consecutive naturals, for example, 1764068 + ... + 2136761.

It is an arithmetic number, because the mean of its divisors is an integer number (70484097270).

Almost surely, 2^726907781663 is an apocalyptic number.

726907781663 is a deficient number, since it is larger than the sum of its proper divisors (118901385577).

726907781663 is a wasteful number, since it uses less digits than its factorization.

726907781663 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3904646 (or 3904639 counting only the distinct ones).

The product of its (nonzero) digits is 32006016, while the sum is 62.

The spelling of 726907781663 in words is "seven hundred twenty-six billion, nine hundred seven million, seven hundred eighty-one thousand, six hundred sixty-three".