168521216 has 20 divisors (see below), whose sum is σ = 336714312. Its totient is φ = 84260352.

The previous prime is 168521209. The next prime is 168521251. The reversal of 168521216 is 612125861.

It is a Harshad number since it is a multiple of its sum of digits (32).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 164060 + ... + 165083.

Almost surely, 2^168521216 is an apocalyptic number.

168521216 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

168521216 is a deficient number, since it is larger than the sum of its proper divisors (168193096).

168521216 is an frugal number, since it uses more digits than its factorization.

168521216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 329161 (or 329145 counting only the distinct ones).

The product of its digits is 5760, while the sum is 32.

The square root of 168521216 is about 12981.5721698106. The cubic root of 168521216 is about 552.3548792706.

The spelling of 168521216 in words is "one hundred sixty-eight million, five hundred twenty-one thousand, two hundred sixteen".