21600766162705 has 8 divisors (see below), whose sum is σ = 25920989101800. Its totient is φ = 17280566459136.

The previous prime is 21600766162697. The next prime is 21600766162709. The reversal of 21600766162705 is 50726166700612.

It can be written as a sum of positive squares in 4 ways, for example, as 19501284609 + 21581264878096 = 139647^2 + 4645564^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21600766162705 - 2³ = 21600766162697 is a prime.

It is a super-2 number, since 2×21600766162705² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21600766162709) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3693640 + ... + 7539529.

It is an arithmetic number, because the mean of its divisors is an integer number (3240123637725).

Almost surely, 2^{21600766162705} is an apocalyptic number.

It is an amenable number.

21600766162705 is a deficient number, since it is larger than the sum of its proper divisors (4320222939095).

21600766162705 is a wasteful number, since it uses less digits than its factorization.

21600766162705 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11617763.

The product of its (nonzero) digits is 1270080, while the sum is 49.

The spelling of 21600766162705 in words is "twenty-one trillion, six hundred billion, seven hundred sixty-six million, one hundred sixty-two thousand, seven hundred five".