21665516163060 has 96 divisors (see below), whose sum is σ = 75632347348992. Its totient is φ = 4501925435520.

The previous prime is 21665516163059. The next prime is 21665516163091. The reversal of 21665516163060 is 6036161556612.

It is a super-2 number, since 2×21665516163060² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2344748212 + ... + 2344757451.

It is an arithmetic number, because the mean of its divisors is an integer number (787836951552).

Almost surely, 2^{21665516163060} is an apocalyptic number.

21665516163060 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21665516163060 is an abundant number, since it is smaller than the sum of its proper divisors (53966831185932).

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

21665516163060 is a wasteful number, since it uses less digits than its factorization.

21665516163060 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4689505693 (or 4689505691 counting only the distinct ones).

The product of its (nonzero) digits is 1166400, while the sum is 48.

The spelling of 21665516163060 in words is "twenty-one trillion, six hundred sixty-five billion, five hundred sixteen million, one hundred sixty-three thousand, sixty".