161107581289 has 4 divisors (see below), whose sum is σ = 163838218320. Its totient is φ = 158376944260.

The previous prime is 161107581269. The next prime is 161107581293. The reversal of 161107581289 is 982185701161.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 161107581289 - 2²⁷ = 160973363561 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161107581269) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1365318427 + ... + 1365318544.

It is an arithmetic number, because the mean of its divisors is an integer number (40959554580).

Almost surely, 2^161107581289 is an apocalyptic number.

It is an amenable number.

161107581289 is a deficient number, since it is larger than the sum of its proper divisors (2730637031).

161107581289 is an equidigital number, since it uses as much as digits as its factorization.

161107581289 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2730637030.

The product of its (nonzero) digits is 241920, while the sum is 49.

The spelling of 161107581289 in words is "one hundred sixty-one billion, one hundred seven million, five hundred eighty-one thousand, two hundred eighty-nine".