216064121556660 has 96 divisors (see below), whose sum is σ = 651540113172480. Its totient is φ = 53183081060352.

The previous prime is 216064121556659. The next prime is 216064121556761. The reversal of 216064121556660 is 66655121460612.

It is a super-2 number, since 2×216064121556660² (a number of 29 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, 16493436 + ... + 26536044.

It is an arithmetic number, because the mean of its divisors is an integer number (6786876178880).

Almost surely, 2^{216064121556660} is an apocalyptic number.

216064121556660 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

216064121556660 is an abundant number, since it is smaller than the sum of its proper divisors (435475991615820).

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

216064121556660 is a wasteful number, since it uses less digits than its factorization.

216064121556660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10070217 (or 10070215 counting only the distinct ones).

The product of its (nonzero) digits is 3110400, while the sum is 51.

The spelling of 216064121556660 in words is "two hundred sixteen trillion, sixty-four billion, one hundred twenty-one million, five hundred fifty-six thousand, six hundred sixty".