27777321045 has 24 divisors (see below), whose sum is σ = 48290253336. Its totient is φ = 14770603008.

The previous prime is 27777321043. The next prime is 27777321067. The reversal of 27777321045 is 54012377772.

It can be written as a sum of positive squares in 4 ways, for example, as 2308033764 + 25469287281 = 48042^2 + 159591^2 .

It is not a de Polignac number, because 27777321045 - 2¹ = 27777321043 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27777321043) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 900672 + ... + 931001.

It is an arithmetic number, because the mean of its divisors is an integer number (2012093889).

Almost surely, 2^27777321045 is an apocalyptic number.

It is an amenable number.

27777321045 is a deficient number, since it is larger than the sum of its proper divisors (20512932291).

27777321045 is a wasteful number, since it uses less digits than its factorization.

27777321045 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1832021 (or 1832018 counting only the distinct ones).

The product of its (nonzero) digits is 576240, while the sum is 45.

The spelling of 27777321045 in words is "twenty-seven billion, seven hundred seventy-seven million, three hundred twenty-one thousand, forty-five".