163998813365 has 8 divisors (see below), whose sum is σ = 196802456760. Its totient is φ = 131196463552.

The previous prime is 163998813359. The next prime is 163998813379. The reversal of 163998813365 is 563318899361.

It can be written as a sum of positive squares in 4 ways, for example, as 3429507844 + 160569305521 = 58562^2 + 400711^2 .

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 163998813365 - 2³⁰ = 162925071541 is a prime.

It is a super-2 number, since 2×163998813365² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 163998813298 and 163998813307.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18314 + ... + 573003.

It is an arithmetic number, because the mean of its divisors is an integer number (24600307095).

Almost surely, 2^163998813365 is an apocalyptic number.

It is an amenable number.

163998813365 is a deficient number, since it is larger than the sum of its proper divisors (32803643395).

163998813365 is an equidigital number, since it uses as much as digits as its factorization.

163998813365 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 646791.

The product of its digits is 25194240, while the sum is 62.

The spelling of 163998813365 in words is "one hundred sixty-three billion, nine hundred ninety-eight million, eight hundred thirteen thousand, three hundred sixty-five".