27721570700066 has 4 divisors (see below), whose sum is σ = 41582356050102. Its totient is φ = 13860785350032.

The previous prime is 27721570700063. The next prime is 27721570700137. The reversal of 27721570700066 is 66000707512772.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 20209745025625 + 7511825674441 = 4495525^2 + 2740771^2 .

It is a junction number, because it is equal to n+sod(n) for n = 27721570699987 and 27721570700023.

It is not an unprimeable number, because it can be changed into a prime (27721570700063) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6930392675015 + ... + 6930392675018.

Almost surely, 2^{27721570700066} is an apocalyptic number.

27721570700066 is a deficient number, since it is larger than the sum of its proper divisors (13860785350036).

27721570700066 is a wasteful number, since it uses less digits than its factorization.

27721570700066 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13860785350035.

The product of its (nonzero) digits is 1728720, while the sum is 50.

The spelling of 27721570700066 in words is "twenty-seven trillion, seven hundred twenty-one billion, five hundred seventy million, seven hundred thousand, sixty-six".