163965290763661 has 2 divisors, whose sum is σ = 163965290763662. Its totient is φ = 163965290763660.

The previous prime is 163965290763653. The next prime is 163965290763667. The reversal of 163965290763661 is 166367092569361.

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., 157127954834761 + 6837335928900 = 12535069^2 + 2614830^2 .

It is a cyclic number.

It is not a de Polignac number, because 163965290763661 - 2³ = 163965290763653 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (163965290763667) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 81982645381830 + 81982645381831.

It is an arithmetic number, because the mean of its divisors is an integer number (81982645381831).

Almost surely, 2^{163965290763661} is an apocalyptic number.

It is an amenable number.

163965290763661 is a deficient number, since it is larger than the sum of its proper divisors (1).

163965290763661 is an equidigital number, since it uses as much as digits as its factorization.

163965290763661 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 396809280, while the sum is 70.

The spelling of 163965290763661 in words is "one hundred sixty-three trillion, nine hundred sixty-five billion, two hundred ninety million, seven hundred sixty-three thousand, six hundred sixty-one".