163720454 has 16 divisors (see below), whose sum is σ = 260064000. Its totient is φ = 77084424.

The previous prime is 163720441. The next prime is 163720471. The reversal of 163720454 is 454027361.

163720454 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×163720454² = 53608774115932232, which contains 22 as substring.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 163720454.

It is a congruent number.

It is an unprimeable number.

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, 6554 + ... + 19245.

It is an arithmetic number, because the mean of its divisors is an integer number (16254000).

Almost surely, 2^163720454 is an apocalyptic number.

163720454 is a deficient number, since it is larger than the sum of its proper divisors (96343546).

163720454 is a wasteful number, since it uses less digits than its factorization.

163720454 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25987.

The product of its (nonzero) digits is 20160, while the sum is 32.

The square root of 163720454 is about 12795.3293822394. The cubic root of 163720454 is about 547.0591841063.

The spelling of 163720454 in words is "one hundred sixty-three million, seven hundred twenty thousand, four hundred fifty-four".