21655032610166 has 16 divisors (see below), whose sum is σ = 32787540080640. Its totient is φ = 10725861323880.

The previous prime is 21655032610117. The next prime is 21655032610171. The reversal of 21655032610166 is 66101623055612.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2808251 + ... + 7155161.

It is an arithmetic number, because the mean of its divisors is an integer number (2049221255040).

Almost surely, 2^{21655032610166} is an apocalyptic number.

21655032610166 is a deficient number, since it is larger than the sum of its proper divisors (11132507470474).

21655032610166 is a wasteful number, since it uses less digits than its factorization.

21655032610166 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4370299.

The product of its (nonzero) digits is 388800, while the sum is 44.

Adding to 21655032610166 its reverse (66101623055612), we get a palindrome (87756655665778).

The spelling of 21655032610166 in words is "twenty-one trillion, six hundred fifty-five billion, thirty-two million, six hundred ten thousand, one hundred sixty-six".