27780302805557 has 4 divisors (see below), whose sum is σ = 27780523548396. Its totient is φ = 27780082062720.

The previous prime is 27780302805517. The next prime is 27780302805587. The reversal of 27780302805557 is 75550820308772.

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 2 ways, for example, as 668141125201 + 27112161680356 = 817399^2 + 5206934^2 .

It is a cyclic number.

It is not a de Polignac number, because 27780302805557 - 2²² = 27780298611253 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 27780302805496 and 27780302805505.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27780302805517) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 110182538 + ... + 110434379.

It is an arithmetic number, because the mean of its divisors is an integer number (6945130887099).

Almost surely, 2^{27780302805557} is an apocalyptic number.

It is an amenable number.

27780302805557 is a deficient number, since it is larger than the sum of its proper divisors (220742839).

27780302805557 is a wasteful number, since it uses less digits than its factorization.

27780302805557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 220742838.

The product of its (nonzero) digits is 32928000, while the sum is 59.

The spelling of 27780302805557 in words is "twenty-seven trillion, seven hundred eighty billion, three hundred two million, eight hundred five thousand, five hundred fifty-seven".