72766726605 has 12 divisors (see below), whose sum is σ = 126128992860. Its totient is φ = 38808920832.

The previous prime is 72766726597. The next prime is 72766726607. The reversal of 72766726605 is 50662766727.

72766726605 is a `hidden beast` number, since 7 + 2 + 7 + 6 + 6 + 7 + 26 + 605 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 34043571081 + 38723155524 = 184509^2 + 196782^2 .

It is not a de Polignac number, because 72766726605 - 2³ = 72766726597 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72766726607) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 808519140 + ... + 808519229.

It is an arithmetic number, because the mean of its divisors is an integer number (10510749405).

Almost surely, 2^72766726605 is an apocalyptic number.

It is an amenable number.

72766726605 is a deficient number, since it is larger than the sum of its proper divisors (53362266255).

72766726605 is a wasteful number, since it uses less digits than its factorization.

72766726605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1617038380 (or 1617038377 counting only the distinct ones).

The product of its (nonzero) digits is 8890560, while the sum is 54.

The spelling of 72766726605 in words is "seventy-two billion, seven hundred sixty-six million, seven hundred twenty-six thousand, six hundred five".