999180168101 has 2 divisors, whose sum is σ = 999180168102. Its totient is φ = 999180168100.

The previous prime is 999180168089. The next prime is 999180168121. The reversal of 999180168101 is 101861081999.

It is a Cunningham number, because it is equal to 999590²+1.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 999180168100 + 1 = 999590^2 + 1^2 .

It is a cyclic number.

It is not a de Polignac number, because 999180168101 - 2³⁰ = 998106426277 is a prime.

It is a super-2 number, since 2×999180168101² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (999180168121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 499590084050 + 499590084051.

It is an arithmetic number, because the mean of its divisors is an integer number (499590084051).

Almost surely, 2^999180168101 is an apocalyptic number.

It is an amenable number.

999180168101 is a deficient number, since it is larger than the sum of its proper divisors (1).

999180168101 is an equidigital number, since it uses as much as digits as its factorization.

999180168101 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 279936, while the sum is 53.

The spelling of 999180168101 in words is "nine hundred ninety-nine billion, one hundred eighty million, one hundred sixty-eight thousand, one hundred one".