161640986123 has 2 divisors, whose sum is σ = 161640986124. Its totient is φ = 161640986122.

The previous prime is 161640986113. The next prime is 161640986179. The reversal of 161640986123 is 321689046161.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 161640986123 - 2³² = 157346018827 is a prime.

It is a super-2 number, since 2×161640986123² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (161640986113) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80820493061 + 80820493062.

It is an arithmetic number, because the mean of its divisors is an integer number (80820493062).

Almost surely, 2^161640986123 is an apocalyptic number.

161640986123 is a deficient number, since it is larger than the sum of its proper divisors (1).

161640986123 is an equidigital number, since it uses as much as digits as its factorization.

161640986123 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 373248, while the sum is 47.

The spelling of 161640986123 in words is "one hundred sixty-one billion, six hundred forty million, nine hundred eighty-six thousand, one hundred twenty-three".