163506551 has 8 divisors (see below), whose sum is σ = 177207744. Its totient is φ = 149965920.

The previous prime is 163506529. The next prime is 163506587. The reversal of 163506551 is 155605361.

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

It is not a de Polignac number, because 163506551 - 2²² = 159312247 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 (163506751) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 38015 + ... + 42096.

It is an arithmetic number, because the mean of its divisors is an integer number (22150968).

Almost surely, 2^163506551 is an apocalyptic number.

163506551 is a deficient number, since it is larger than the sum of its proper divisors (13701193).

163506551 is a wasteful number, since it uses less digits than its factorization.

163506551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80281.

The product of its (nonzero) digits is 13500, while the sum is 32.

The square root of 163506551 is about 12786.9680143496. The cubic root of 163506551 is about 546.8208335184.

The spelling of 163506551 in words is "one hundred sixty-three million, five hundred six thousand, five hundred fifty-one".