163788991073 has 8 divisors (see below), whose sum is σ = 163939608840. Its totient is φ = 163638420480.

The previous prime is 163788991021. The next prime is 163788991141. The reversal of 163788991073 is 370199887361.

It can be written as a sum of positive squares in 4 ways, for example, as 47747931169 + 116041059904 = 218513^2 + 340648^2 .

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 163788991073 - 2⁸ = 163788990817 is a prime.

It is a super-2 number, since 2×163788991073² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 163788990997 and 163788991015.

It is not an unprimeable number, because it can be changed into a prime (163788990073) 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, 12701213 + ... + 12714101.

It is an arithmetic number, because the mean of its divisors is an integer number (20492451105).

Almost surely, 2^163788991073 is an apocalyptic number.

It is an amenable number.

163788991073 is a deficient number, since it is larger than the sum of its proper divisors (150617767).

163788991073 is a wasteful number, since it uses less digits than its factorization.

163788991073 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23587.

The product of its (nonzero) digits is 13716864, while the sum is 62.

The spelling of 163788991073 in words is "one hundred sixty-three billion, seven hundred eighty-eight million, nine hundred ninety-one thousand, seventy-three".