163540366405243 has 4 divisors (see below), whose sum is σ = 163593412261848. Its totient is φ = 163487320548640.

The previous prime is 163540366404953. The next prime is 163540366405327. The reversal of 163540366405243 is 342504663045361.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 163540366405243 - 2²¹ = 163540364308091 is a prime.

It is a super-2 number, since 2×163540366405243² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (163540366405943) 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, 26522923678 + ... + 26522929843.

It is an arithmetic number, because the mean of its divisors is an integer number (40898353065462).

Almost surely, 2^{163540366405243} is an apocalyptic number.

163540366405243 is a deficient number, since it is larger than the sum of its proper divisors (53045856605).

163540366405243 is an equidigital number, since it uses as much as digits as its factorization.

163540366405243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53045856604.

The product of its (nonzero) digits is 18662400, while the sum is 52.

The spelling of 163540366405243 in words is "one hundred sixty-three trillion, five hundred forty billion, three hundred sixty-six million, four hundred five thousand, two hundred forty-three".