163440551 has 2 divisors, whose sum is σ = 163440552. Its totient is φ = 163440550.

The previous prime is 163440521. The next prime is 163440569. The reversal of 163440551 is 155044361.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-163440551 is a prime.

It is a super-2 number, since 2×163440551² = 53425627422367202, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (163440521) 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 as a sum of consecutive naturals, namely, 81720275 + 81720276.

It is an arithmetic number, because the mean of its divisors is an integer number (81720276).

Almost surely, 2^163440551 is an apocalyptic number.

163440551 is a deficient number, since it is larger than the sum of its proper divisors (1).

163440551 is an equidigital number, since it uses as much as digits as its factorization.

163440551 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7200, while the sum is 29.

The square root of 163440551 is about 12784.3870013388. The cubic root of 163440551 is about 546.7472482260.

The spelling of 163440551 in words is "one hundred sixty-three million, four hundred forty thousand, five hundred fifty-one".