161356365 has 12 divisors (see below), whose sum is σ = 279684444. Its totient is φ = 86056704.

The previous prime is 161356357. The next prime is 161356373. The reversal of 161356365 is 563653161.

161356365 is a `hidden beast` number, since 1 + 6 + 13 + 5 + 636 + 5 = 666.

161356365 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (161356357) and next prime (161356373).

It can be written as a sum of positive squares in 2 ways, for example, as 26842761 + 134513604 = 5181^2 + 11598^2 .

It is not a de Polignac number, because 161356365 - 2³ = 161356357 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1792804 + ... + 1792893.

It is an arithmetic number, because the mean of its divisors is an integer number (23307037).

Almost surely, 2^161356365 is an apocalyptic number.

161356365 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

161356365 is a deficient number, since it is larger than the sum of its proper divisors (118328079).

161356365 is a wasteful number, since it uses less digits than its factorization.

161356365 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3585708 (or 3585705 counting only the distinct ones).

The product of its digits is 48600, while the sum is 36.

The square root of 161356365 is about 12702.6125265632. The cubic root of 161356365 is about 544.4132675084.

It can be divided in two parts, 16135 and 6365, that added together give a square (22500 = 150²).

The spelling of 161356365 in words is "one hundred sixty-one million, three hundred fifty-six thousand, three hundred sixty-five".