163720453 has 8 divisors (see below), whose sum is σ = 177335928. Its totient is φ = 150250944.

The previous prime is 163720441. The next prime is 163720471. The reversal of 163720453 is 354027361.

It can be written as a sum of positive squares in 4 ways, for example, as 35736484 + 127983969 = 5978^2 + 11313^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 163720453 - 2¹⁷ = 163589381 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (163720483) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 34150 + ... + 38647.

It is an arithmetic number, because the mean of its divisors is an integer number (22166991).

Almost surely, 2^163720453 is an apocalyptic number.

163720453 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

163720453 is a deficient number, since it is larger than the sum of its proper divisors (13615475).

163720453 is a wasteful number, since it uses less digits than its factorization.

163720453 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72983.

The product of its (nonzero) digits is 15120, while the sum is 31.

The square root of 163720453 is about 12795.3293431627. The cubic root of 163720453 is about 547.0591829925.

The spelling of 163720453 in words is "one hundred sixty-three million, seven hundred twenty thousand, four hundred fifty-three".