27780550005533 has 4 divisors (see below), whose sum is σ = 29917515390588. Its totient is φ = 25643584620480.

The previous prime is 27780550005529. The next prime is 27780550005583. The reversal of 27780550005533 is 33550005508772.

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 14068178073049 + 13712371932484 = 3750757^2 + 3703022^2 .

It is a cyclic number.

It is not a de Polignac number, because 27780550005533 - 2² = 27780550005529 is a prime.

It is a super-2 number, since 2×27780550005533² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27780550005583) 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, 1068482692508 + ... + 1068482692533.

It is an arithmetic number, because the mean of its divisors is an integer number (7479378847647).

Almost surely, 2^{27780550005533} is an apocalyptic number.

It is an amenable number.

27780550005533 is a deficient number, since it is larger than the sum of its proper divisors (2136965385055).

27780550005533 is a wasteful number, since it uses less digits than its factorization.

27780550005533 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2136965385054.

The product of its (nonzero) digits is 4410000, while the sum is 50.

The spelling of 27780550005533 in words is "twenty-seven trillion, seven hundred eighty billion, five hundred fifty million, five thousand, five hundred thirty-three".