161001568111 has 2 divisors, whose sum is σ = 161001568112. Its totient is φ = 161001568110.

The previous prime is 161001568103. The next prime is 161001568129. The reversal of 161001568111 is 111865100161.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 161001568111 - 2³ = 161001568103 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (161001568151) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80500784055 + 80500784056.

It is an arithmetic number, because the mean of its divisors is an integer number (80500784056).

Almost surely, 2^161001568111 is an apocalyptic number.

161001568111 is a deficient number, since it is larger than the sum of its proper divisors (1).

161001568111 is an equidigital number, since it uses as much as digits as its factorization.

161001568111 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1440, while the sum is 31.

Adding to 161001568111 its reverse (111865100161), we get a palindrome (272866668272).

The spelling of 161001568111 in words is "one hundred sixty-one billion, one million, five hundred sixty-eight thousand, one hundred eleven".