27205445642 has 4 divisors (see below), whose sum is σ = 40808168466. Its totient is φ = 13602722820.

The previous prime is 27205445639. The next prime is 27205445671. The reversal of 27205445642 is 24654450272.

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., 25261605721 + 1943839921 = 158939^2 + 44089^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 27205445642.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 6801361409 + ... + 6801361412.

Almost surely, 2^27205445642 is an apocalyptic number.

27205445642 is a deficient number, since it is larger than the sum of its proper divisors (13602722824).

27205445642 is a wasteful number, since it uses less digits than its factorization.

27205445642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13602722823.

The product of its (nonzero) digits is 537600, while the sum is 41.

The spelling of 27205445642 in words is "twenty-seven billion, two hundred five million, four hundred forty-five thousand, six hundred forty-two".