161505115106639 has 2 divisors, whose sum is σ = 161505115106640. Its totient is φ = 161505115106638.

The previous prime is 161505115106497. The next prime is 161505115106669. The reversal of 161505115106639 is 936601511505161.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 161505115106639 - 2³⁶ = 161436395629903 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (161505115106669) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80752557553319 + 80752557553320.

It is an arithmetic number, because the mean of its divisors is an integer number (80752557553320).

Almost surely, 2^{161505115106639} is an apocalyptic number.

161505115106639 is a deficient number, since it is larger than the sum of its proper divisors (1).

161505115106639 is an equidigital number, since it uses as much as digits as its factorization.

161505115106639 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 729000, while the sum is 50.

The spelling of 161505115106639 in words is "one hundred sixty-one trillion, five hundred five billion, one hundred fifteen million, one hundred six thousand, six hundred thirty-nine".