21166516662 has 8 divisors (see below), whose sum is σ = 42333033336. Its totient is φ = 7055505552.

The previous prime is 21166516649. The next prime is 21166516673. The reversal of 21166516662 is 26661566112.

It is a sphenic number, since it is the product of 3 distinct primes.

21166516662 is an admirable number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1763876383 + ... + 1763876394.

It is an arithmetic number, because the mean of its divisors is an integer number (5291629167).

Almost surely, 2^21166516662 is an apocalyptic number.

21166516662 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

21166516662 is a wasteful number, since it uses less digits than its factorization.

21166516662 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3527752782.

The product of its digits is 155520, while the sum is 42.

The spelling of 21166516662 in words is "twenty-one billion, one hundred sixty-six million, five hundred sixteen thousand, six hundred sixty-two".