216171702171620 has 24 divisors (see below), whose sum is σ = 488880618757944. Its totient is φ = 79817243878656.

The previous prime is 216171702171617. The next prime is 216171702171631. The reversal of 216171702171620 is 26171207171612.

It is a happy number.

216171702171620 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 3019177306084 + 213152524865536 = 1737578^2 + 14599744^2 .

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, 415714811609 + ... + 415714812128.

It is an arithmetic number, because the mean of its divisors is an integer number (20370025781581).

Almost surely, 2^{216171702171620} is an apocalyptic number.

216171702171620 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

216171702171620 is an abundant number, since it is smaller than the sum of its proper divisors (272708916586324).

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

216171702171620 is a wasteful number, since it uses less digits than its factorization.

216171702171620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 831429623759 (or 831429623757 counting only the distinct ones).

The product of its (nonzero) digits is 98784, while the sum is 44.

The spelling of 216171702171620 in words is "two hundred sixteen trillion, one hundred seventy-one billion, seven hundred two million, one hundred seventy-one thousand, six hundred twenty".