165860669361 has 4 divisors (see below), whose sum is σ = 221147559152. Its totient is φ = 110573779572.

The previous prime is 165860669357. The next prime is 165860669459. The reversal of 165860669361 is 163966068561.

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, and also an emirpimes, since its reverse is a distinct semiprime: 163966068561 = 3 ⋅54655356187.

It is not a de Polignac number, because 165860669361 - 2² = 165860669357 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (165860661361) 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, 27643444891 + ... + 27643444896.

It is an arithmetic number, because the mean of its divisors is an integer number (55286889788).

Almost surely, 2^165860669361 is an apocalyptic number.

It is an amenable number.

165860669361 is a deficient number, since it is larger than the sum of its proper divisors (55286889791).

165860669361 is an equidigital number, since it uses as much as digits as its factorization.

165860669361 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55286889790.

The product of its (nonzero) digits is 8398080, while the sum is 57.

The spelling of 165860669361 in words is "one hundred sixty-five billion, eight hundred sixty million, six hundred sixty-nine thousand, three hundred sixty-one".