161740047161 has 64 divisors (see below), whose sum is σ = 209212416000. Its totient is φ = 123934406400.

The previous prime is 161740047127. The next prime is 161740047169.

161740047161 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 161740047161 - 2⁶ = 161740047097 is a prime.

It is not an unprimeable number, because it can be changed into a prime (161740047169) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 74843921 + ... + 74846081.

It is an arithmetic number, because the mean of its divisors is an integer number (3268944000).

Almost surely, 2^161740047161 is an apocalyptic number.

161740047161 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

161740047161 is a deficient number, since it is larger than the sum of its proper divisors (47472368839).

161740047161 is a wasteful number, since it uses less digits than its factorization.

161740047161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2515 (or 2501 counting only the distinct ones).

The product of its (nonzero) digits is 28224, while the sum is 38.

The spelling of 161740047161 in words is "one hundred sixty-one billion, seven hundred forty million, forty-seven thousand, one hundred sixty-one".