163201308181 has 2 divisors, whose sum is σ = 163201308182. Its totient is φ = 163201308180.

The previous prime is 163201308121. The next prime is 163201308191. The reversal of 163201308181 is 181803102361.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 107252975025 + 55948333156 = 327495^2 + 236534^2 .

It is a cyclic number.

It is not a de Polignac number, because 163201308181 - 2¹¹ = 163201306133 is a prime.

It is a super-2 number, since 2×163201308181² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (163201308121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 81600654090 + 81600654091.

It is an arithmetic number, because the mean of its divisors is an integer number (81600654091).

Almost surely, 2^163201308181 is an apocalyptic number.

It is an amenable number.

163201308181 is a deficient number, since it is larger than the sum of its proper divisors (1).

163201308181 is an equidigital number, since it uses as much as digits as its factorization.

163201308181 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6912, while the sum is 34.

The spelling of 163201308181 in words is "one hundred sixty-three billion, two hundred one million, three hundred eight thousand, one hundred eighty-one".