161817563383 has 16 divisors (see below), whose sum is σ = 201105094464. Its totient is φ = 127013736960.

The previous prime is 161817563377. The next prime is 161817563387. The reversal of 161817563383 is 383365718161.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-161817563383 is a prime.

It is a super-2 number, since 2×161817563383² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 161817563383.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161817563387) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18371428 + ... + 18380233.

It is an arithmetic number, because the mean of its divisors is an integer number (12569068404).

Almost surely, 2^161817563383 is an apocalyptic number.

161817563383 is a deficient number, since it is larger than the sum of its proper divisors (39287531081).

161817563383 is a wasteful number, since it uses less digits than its factorization.

161817563383 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36751722.

The product of its digits is 2177280, while the sum is 52.

The spelling of 161817563383 in words is "one hundred sixty-one billion, eight hundred seventeen million, five hundred sixty-three thousand, three hundred eighty-three".