161011929929 has 2 divisors, whose sum is σ = 161011929930. Its totient is φ = 161011929928.

The previous prime is 161011929887. The next prime is 161011929943. The reversal of 161011929929 is 929929110161.

161011929929 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 160682325904 + 329604025 = 400852^2 + 18155^2 .

It is a cyclic number.

It is not a de Polignac number, because 161011929929 - 2²⁸ = 160743494473 is a prime.

It is a super-2 number, since 2×161011929929² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (161011929229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80505964964 + 80505964965.

It is an arithmetic number, because the mean of its divisors is an integer number (80505964965).

Almost surely, 2^161011929929 is an apocalyptic number.

It is an amenable number.

161011929929 is a deficient number, since it is larger than the sum of its proper divisors (1).

161011929929 is an equidigital number, since it uses as much as digits as its factorization.

161011929929 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 157464, while the sum is 50.

The spelling of 161011929929 in words is "one hundred sixty-one billion, eleven million, nine hundred twenty-nine thousand, nine hundred twenty-nine".