161505964411 has 4 divisors (see below), whose sum is σ = 176188324824. Its totient is φ = 146823604000.

The previous prime is 161505964409. The next prime is 161505964429. The reversal of 161505964411 is 114469505161.

It is a happy number.

161505964411 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 161505964411 - 2¹ = 161505964409 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161505964811) 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 3 ways as a sum of consecutive naturals, for example, 7341180190 + ... + 7341180211.

It is an arithmetic number, because the mean of its divisors is an integer number (44047081206).

Almost surely, 2^161505964411 is an apocalyptic number.

161505964411 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

161505964411 is a deficient number, since it is larger than the sum of its proper divisors (14682360413).

161505964411 is a wasteful number, since it uses less digits than its factorization.

161505964411 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14682360412.

The product of its (nonzero) digits is 129600, while the sum is 43.

The spelling of 161505964411 in words is "one hundred sixty-one billion, five hundred five million, nine hundred sixty-four thousand, four hundred eleven".