27764021166 has 64 divisors (see below), whose sum is σ = 66244055040. Its totient is φ = 7590401280.

The previous prime is 27764021147. The next prime is 27764021191. The reversal of 27764021166 is 66112046772.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3921 + ... + 235676.

It is an arithmetic number, because the mean of its divisors is an integer number (1035063360).

Almost surely, 2^27764021166 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 27764021166, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33122027520).

27764021166 is an abundant number, since it is smaller than the sum of its proper divisors (38480033874).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

27764021166 is a wasteful number, since it uses less digits than its factorization.

27764021166 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 239729.

The product of its (nonzero) digits is 169344, while the sum is 42.

The spelling of 27764021166 in words is "twenty-seven billion, seven hundred sixty-four million, twenty-one thousand, one hundred sixty-six".