16868180053921 has 27 divisors (see below), whose sum is σ = 19864238687091. Its totient is φ = 14282221285584.

The previous prime is 16868180053913. The next prime is 16868180053927. The reversal of 16868180053921 is 12935008186861.

It is a happy number.

The square root of 16868180053921 is 4107089.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 5900823163921 + 10967356890000 = 2429161^2 + 3311700^2 .

It is not a de Polignac number, because 16868180053921 - 2³ = 16868180053913 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16868180053927) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 2386215175 + ... + 2386222243.

Almost surely, 2^{16868180053921} is an apocalyptic number.

16868180053921 is the 4107089-th square number.

16868180053921 is the 2053545-th centered octagonal number.

It is an amenable number.

16868180053921 is a deficient number, since it is larger than the sum of its proper divisors (2996058633170).

16868180053921 is an frugal number, since it uses more digits than its factorization.

16868180053921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14318 (or 7159 counting only the distinct ones).

The product of its (nonzero) digits is 4976640, while the sum is 58.

The spelling of 16868180053921 in words is "sixteen trillion, eight hundred sixty-eight billion, one hundred eighty million, fifty-three thousand, nine hundred twenty-one".