21166305811662 has 64 divisors (see below), whose sum is σ = 46206686937600. Its totient is φ = 6410469703680.

The previous prime is 21166305811627. The next prime is 21166305811687. The reversal of 21166305811662 is 26611850366112.

It is a congruent number.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 1806147039 + ... + 1806158757.

It is an arithmetic number, because the mean of its divisors is an integer number (721979483400).

Almost surely, 2^{21166305811662} is an apocalyptic number.

21166305811662 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21166305811662 is an abundant number, since it is smaller than the sum of its proper divisors (25040381125938).

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

21166305811662 is a wasteful number, since it uses less digits than its factorization.

21166305811662 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24601.

The product of its (nonzero) digits is 622080, while the sum is 48.

The spelling of 21166305811662 in words is "twenty-one trillion, one hundred sixty-six billion, three hundred five million, eight hundred eleven thousand, six hundred sixty-two".