726172773849 has 12 divisors (see below), whose sum is σ = 1048930813476. Its totient is φ = 484108451232.

The previous prime is 726172773793. The next prime is 726172773869. The reversal of 726172773849 is 948377271627.

726172773849 is a `hidden beast` number, since 7 + 2 + 617 + 2 + 7 + 7 + 3 + 8 + 4 + 9 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 363088194624 + 363084579225 = 602568^2 + 602565^2 .

It is not a de Polignac number, because 726172773849 - 2¹³ = 726172765657 is a prime.

It is not an unprimeable number, because it can be changed into a prime (726172773869) 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, 172807 + ... + 1217459.

It is an arithmetic number, because the mean of its divisors is an integer number (87410901123).

Almost surely, 2^726172773849 is an apocalyptic number.

It is an amenable number.

726172773849 is a deficient number, since it is larger than the sum of its proper divisors (322758039627).

726172773849 is a wasteful number, since it uses less digits than its factorization.

726172773849 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1121896 (or 1121893 counting only the distinct ones).

The product of its digits is 49787136, while the sum is 63.

The spelling of 726172773849 in words is "seven hundred twenty-six billion, one hundred seventy-two million, seven hundred seventy-three thousand, eight hundred forty-nine".