216510661201650 has 48 divisors (see below), whose sum is σ = 537011205431328. Its totient is φ = 57729212272000.

The previous prime is 216510661201649. The next prime is 216510661201673. The reversal of 216510661201650 is 56102166015612.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 85802811 + ... + 88290110.

It is an arithmetic number, because the mean of its divisors is an integer number (11187733446486).

Almost surely, 2^{216510661201650} is an apocalyptic number.

216510661201650 is an abundant number, since it is smaller than the sum of its proper divisors (320500544229678).

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

216510661201650 is a wasteful number, since it uses less digits than its factorization.

216510661201650 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 174101227 (or 174101222 counting only the distinct ones).

The product of its (nonzero) digits is 129600, while the sum is 42.

The spelling of 216510661201650 in words is "two hundred sixteen trillion, five hundred ten billion, six hundred sixty-one million, two hundred one thousand, six hundred fifty".