161662017363761 has 2 divisors, whose sum is σ = 161662017363762. Its totient is φ = 161662017363760.

The previous prime is 161662017363733. The next prime is 161662017363767. The reversal of 161662017363761 is 167363710266161.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 144673144840225 + 16988872523536 = 12028015^2 + 4121756^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-161662017363761 is a prime.

It is a super-2 number, since 2×161662017363761² (a number of 29 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 161662017363697 and 161662017363706.

It is not a weakly prime, because it can be changed into another prime (161662017363767) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80831008681880 + 80831008681881.

It is an arithmetic number, because the mean of its divisors is an integer number (80831008681881).

Almost surely, 2^{161662017363761} is an apocalyptic number.

It is an amenable number.

161662017363761 is a deficient number, since it is larger than the sum of its proper divisors (1).

161662017363761 is an equidigital number, since it uses as much as digits as its factorization.

161662017363761 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6858432, while the sum is 56.

The spelling of 161662017363761 in words is "one hundred sixty-one trillion, six hundred sixty-two billion, seventeen million, three hundred sixty-three thousand, seven hundred sixty-one".