161683840741 has 2 divisors, whose sum is σ = 161683840742. Its totient is φ = 161683840740.

The previous prime is 161683840711. The next prime is 161683840753. The reversal of 161683840741 is 147048386161.

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., 98705930625 + 62977910116 = 314175^2 + 250954^2 .

It is a cyclic number.

It is not a de Polignac number, because 161683840741 - 2⁷ = 161683840613 is a prime.

It is a super-2 number, since 2×161683840741² (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 (161683840711) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80841920370 + 80841920371.

It is an arithmetic number, because the mean of its divisors is an integer number (80841920371).

Almost surely, 2^161683840741 is an apocalyptic number.

It is an amenable number.

161683840741 is a deficient number, since it is larger than the sum of its proper divisors (1).

161683840741 is an equidigital number, since it uses as much as digits as its factorization.

161683840741 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 774144, while the sum is 49.

The spelling of 161683840741 in words is "one hundred sixty-one billion, six hundred eighty-three million, eight hundred forty thousand, seven hundred forty-one".