161011929887 has 2 divisors, whose sum is σ = 161011929888. Its totient is φ = 161011929886.

The previous prime is 161011929863. The next prime is 161011929929. The reversal of 161011929887 is 788929110161.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 161011929887 - 2¹⁰ = 161011928863 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (161011929187) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80505964943 + 80505964944.

It is an arithmetic number, because the mean of its divisors is an integer number (80505964944).

Almost surely, 2^161011929887 is an apocalyptic number.

161011929887 is a deficient number, since it is larger than the sum of its proper divisors (1).

161011929887 is an equidigital number, since it uses as much as digits as its factorization.

161011929887 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 435456, while the sum is 53.

The spelling of 161011929887 in words is "one hundred sixty-one billion, eleven million, nine hundred twenty-nine thousand, eight hundred eighty-seven".