161969719043 has 16 divisors (see below), whose sum is σ = 177931065312. Its totient is φ = 146217984000.

The previous prime is 161969719013. The next prime is 161969719049. The reversal of 161969719043 is 340917969161.

It is a happy number.

It is not a de Polignac number, because 161969719043 - 2⁶ = 161969718979 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 161969719043.

It is not an unprimeable number, because it can be changed into a prime (161969719049) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 849263 + ... + 1022343.

It is an arithmetic number, because the mean of its divisors is an integer number (11120691582).

Almost surely, 2^161969719043 is an apocalyptic number.

161969719043 is a deficient number, since it is larger than the sum of its proper divisors (15961346269).

161969719043 is a wasteful number, since it uses less digits than its factorization.

161969719043 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 173686.

The product of its (nonzero) digits is 2204496, while the sum is 56.

The spelling of 161969719043 in words is "one hundred sixty-one billion, nine hundred sixty-nine million, seven hundred nineteen thousand, forty-three".