168804553 has 2 divisors, whose sum is σ = 168804554. Its totient is φ = 168804552.

The previous prime is 168804551. The next prime is 168804733. The reversal of 168804553 is 355408861.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 118635664 + 50168889 = 10892^2 + 7083^2 .

It is a cyclic number.

It is not a de Polignac number, because 168804553 - 2¹ = 168804551 is a prime.

It is a super-2 number, since 2×168804553² = 56989954227059618, which contains 22 as substring.

Together with 168804551, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (168804551) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 84402276 + 84402277.

It is an arithmetic number, because the mean of its divisors is an integer number (84402277).

Almost surely, 2^168804553 is an apocalyptic number.

It is an amenable number.

168804553 is a deficient number, since it is larger than the sum of its proper divisors (1).

168804553 is an equidigital number, since it uses as much as digits as its factorization.

168804553 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 115200, while the sum is 40.

The square root of 168804553 is about 12992.4806330431. The cubic root of 168804553 is about 552.6642665197.

The spelling of 168804553 in words is "one hundred sixty-eight million, eight hundred four thousand, five hundred fifty-three".