21167546166 has 24 divisors (see below), whose sum is σ = 49390941600. Its totient is φ = 6513091056.

The previous prime is 21167546161. The next prime is 21167546167. The reversal of 21167546166 is 66164576112.

21167546166 is a `hidden beast` number, since 2 + 116 + 75 + 461 + 6 + 6 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21167546161) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 45229566 + ... + 45230033.

It is an arithmetic number, because the mean of its divisors is an integer number (2057955900).

Almost surely, 2^21167546166 is an apocalyptic number.

21167546166 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

21167546166 is an abundant number, since it is smaller than the sum of its proper divisors (28223395434).

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

21167546166 is a wasteful number, since it uses less digits than its factorization.

21167546166 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90459620 (or 90459617 counting only the distinct ones).

The product of its digits is 362880, while the sum is 45.

The spelling of 21167546166 in words is "twenty-one billion, one hundred sixty-seven million, five hundred forty-six thousand, one hundred sixty-six".