161003959009 has 2 divisors, whose sum is σ = 161003959010. Its totient is φ = 161003959008.

The previous prime is 161003958971. The next prime is 161003959019. The reversal of 161003959009 is 900959300161.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 116789645025 + 44214313984 = 341745^2 + 210272^2 .

It is a cyclic number.

It is not a de Polignac number, because 161003959009 - 2¹⁷ = 161003827937 is a prime.

It is not a weakly prime, because it can be changed into another prime (161003959019) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80501979504 + 80501979505.

It is an arithmetic number, because the mean of its divisors is an integer number (80501979505).

Almost surely, 2^161003959009 is an apocalyptic number.

It is an amenable number.

161003959009 is a deficient number, since it is larger than the sum of its proper divisors (1).

161003959009 is an equidigital number, since it uses as much as digits as its factorization.

161003959009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 65610, while the sum is 43.

The spelling of 161003959009 in words is "one hundred sixty-one billion, three million, nine hundred fifty-nine thousand, nine".