168821456 has 10 divisors (see below), whose sum is σ = 327091602. Its totient is φ = 84410720.

The previous prime is 168821447. The next prime is 168821467. The reversal of 168821456 is 654128861.

It can be written as a sum of positive squares in only one way, i.e., 168480400 + 341056 = 12980^2 + 584^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5275655 + ... + 5275686.

Almost surely, 2^168821456 is an apocalyptic number.

168821456 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

168821456 is a deficient number, since it is larger than the sum of its proper divisors (158270146).

168821456 is a wasteful number, since it uses less digits than its factorization.

168821456 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10551349 (or 10551343 counting only the distinct ones).

The product of its digits is 92160, while the sum is 41.

The square root of 168821456 is about 12993.1311083972. The cubic root of 168821456 is about 552.6827126500.

The spelling of 168821456 in words is "one hundred sixty-eight million, eight hundred twenty-one thousand, four hundred fifty-six".