161211950019 has 6 divisors (see below), whose sum is σ = 232861705596. Its totient is φ = 107474633340.

The previous prime is 161211949981. The next prime is 161211950027. The reversal of 161211950019 is 910059112161.

161211950019 is a `hidden beast` number, since 1 + 6 + 121 + 19 + 500 + 19 = 666.

161211950019 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 161211950019 - 2²⁹ = 160675079107 is a prime.

It is a super-2 number, since 2×161211950019² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (161211900019) 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 in 5 ways as a sum of consecutive naturals, for example, 8956219437 + ... + 8956219454.

It is an arithmetic number, because the mean of its divisors is an integer number (38810284266).

Almost surely, 2^161211950019 is an apocalyptic number.

161211950019 is a deficient number, since it is larger than the sum of its proper divisors (71649755577).

161211950019 is a wasteful number, since it uses less digits than its factorization.

161211950019 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17912438897 (or 17912438894 counting only the distinct ones).

The product of its (nonzero) digits is 4860, while the sum is 36.

The spelling of 161211950019 in words is "one hundred sixty-one billion, two hundred eleven million, nine hundred fifty thousand, nineteen".