165561367 has 4 divisors (see below), whose sum is σ = 166616056. Its totient is φ = 164506680.

The previous prime is 165561353. The next prime is 165561379. The reversal of 165561367 is 763165561.

165561367 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, and also an emirpimes, since its reverse is a distinct semiprime: 763165561 = 2707 ⋅281923.

It is a cyclic number.

It is not a de Polignac number, because 165561367 - 2¹¹ = 165559319 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (165561397) 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, 527109 + ... + 527422.

It is an arithmetic number, because the mean of its divisors is an integer number (41654014).

Almost surely, 2^165561367 is an apocalyptic number.

165561367 is a deficient number, since it is larger than the sum of its proper divisors (1054689).

165561367 is a wasteful number, since it uses less digits than its factorization.

165561367 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1054688.

The product of its digits is 113400, while the sum is 40.

The square root of 165561367 is about 12867.0652053994. The cubic root of 165561367 is about 549.1019692192.

The spelling of 165561367 in words is "one hundred sixty-five million, five hundred sixty-one thousand, three hundred sixty-seven".