163431435553 has 2 divisors, whose sum is σ = 163431435554. Its totient is φ = 163431435552.

The previous prime is 163431435551. The next prime is 163431435613. The reversal of 163431435553 is 355534134361.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 94733452944 + 68697982609 = 307788^2 + 262103^2 .

It is a cyclic number.

It is not a de Polignac number, because 163431435553 - 2¹ = 163431435551 is a prime.

Together with 163431435551, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (163431435551) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 81715717776 + 81715717777.

It is an arithmetic number, because the mean of its divisors is an integer number (81715717777).

Almost surely, 2^163431435553 is an apocalyptic number.

It is an amenable number.

163431435553 is a deficient number, since it is larger than the sum of its proper divisors (1).

163431435553 is an equidigital number, since it uses as much as digits as its factorization.

163431435553 is an evil number, because the sum of its binary digits is even.

The product of its digits is 972000, while the sum is 43.

The spelling of 163431435553 in words is "one hundred sixty-three billion, four hundred thirty-one million, four hundred thirty-five thousand, five hundred fifty-three".