27720225361 has 4 divisors (see below), whose sum is σ = 27721772212. Its totient is φ = 27718678512.

The previous prime is 27720225359. The next prime is 27720225499. The reversal of 27720225361 is 16352202772.

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

It can be written as a sum of positive squares in 2 ways, for example, as 15183168400 + 12537056961 = 123220^2 + 111969^2 .

It is a cyclic number.

It is not a de Polignac number, because 27720225361 - 2¹ = 27720225359 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 27720225361.

It is not an unprimeable number, because it can be changed into a prime (27720225341) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 746226 + ... + 782491.

It is an arithmetic number, because the mean of its divisors is an integer number (6930443053).

Almost surely, 2^27720225361 is an apocalyptic number.

It is an amenable number.

27720225361 is a deficient number, since it is larger than the sum of its proper divisors (1546851).

27720225361 is a wasteful number, since it uses less digits than its factorization.

27720225361 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1546850.

The product of its (nonzero) digits is 70560, while the sum is 37.

It can be divided in two parts, 27720225 and 361, that multiplied together give a square (10007001225 = 100035²).

The spelling of 27720225361 in words is "twenty-seven billion, seven hundred twenty million, two hundred twenty-five thousand, three hundred sixty-one".