163420018505 has 8 divisors (see below), whose sum is σ = 207639553032. Its totient is φ = 123045660928.

The previous prime is 163420018501. The next prime is 163420018519. The reversal of 163420018505 is 505810024361.

It can be written as a sum of positive squares in 4 ways, for example, as 30245383744 + 133174634761 = 173912^2 + 364931^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 163420018505 - 2² = 163420018501 is a prime.

It is a super-2 number, since 2×163420018505² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (163420018501) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 961294142 + ... + 961294311.

It is an arithmetic number, because the mean of its divisors is an integer number (25954944129).

Almost surely, 2^163420018505 is an apocalyptic number.

It is an amenable number.

163420018505 is a deficient number, since it is larger than the sum of its proper divisors (44219534527).

163420018505 is a wasteful number, since it uses less digits than its factorization.

163420018505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1922588475.

The product of its (nonzero) digits is 28800, while the sum is 35.

The spelling of 163420018505 in words is "one hundred sixty-three billion, four hundred twenty million, eighteen thousand, five hundred five".