163005551 has 4 divisors (see below), whose sum is σ = 164448192. Its totient is φ = 161562912.

The previous prime is 163005517. The next prime is 163005587. The reversal of 163005551 is 155500361.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 155500361 = 79 ⋅1968359.

It is a cyclic number.

It is not a de Polignac number, because 163005551 - 2⁶ = 163005487 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 163005551.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (163005511) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 721151 + ... + 721376.

It is an arithmetic number, because the mean of its divisors is an integer number (41112048).

Almost surely, 2^163005551 is an apocalyptic number.

163005551 is a deficient number, since it is larger than the sum of its proper divisors (1442641).

163005551 is a wasteful number, since it uses less digits than its factorization.

163005551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1442640.

The product of its (nonzero) digits is 2250, while the sum is 26.

The square root of 163005551 is about 12767.3627268908. The cubic root of 163005551 is about 546.2617580078.

The spelling of 163005551 in words is "one hundred sixty-three million, five thousand, five hundred fifty-one".