163661771123 has 2 divisors, whose sum is σ = 163661771124. Its totient is φ = 163661771122.

The previous prime is 163661771087. The next prime is 163661771137. The reversal of 163661771123 is 321177166361.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 163661771123 - 2⁶ = 163661771059 is a prime.

It is a super-2 number, since 2×163661771123² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (163661771173) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 81830885561 + 81830885562.

It is an arithmetic number, because the mean of its divisors is an integer number (81830885562).

Almost surely, 2^163661771123 is an apocalyptic number.

163661771123 is a deficient number, since it is larger than the sum of its proper divisors (1).

163661771123 is an equidigital number, since it uses as much as digits as its factorization.

163661771123 is an evil number, because the sum of its binary digits is even.

The product of its digits is 190512, while the sum is 44.

The spelling of 163661771123 in words is "one hundred sixty-three billion, six hundred sixty-one million, seven hundred seventy-one thousand, one hundred twenty-three".