161365373 has 8 divisors (see below), whose sum is σ = 174298488. Its totient is φ = 148506624.

The previous prime is 161365339. The next prime is 161365427. The reversal of 161365373 is 373563161.

It can be written as a sum of positive squares in 4 ways, for example, as 10640644 + 150724729 = 3262^2 + 12277^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 161365373 - 2¹⁰ = 161364349 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161365073) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 14036 + ... + 22797.

It is an arithmetic number, because the mean of its divisors is an integer number (21787311).

Almost surely, 2^161365373 is an apocalyptic number.

161365373 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

161365373 is a deficient number, since it is larger than the sum of its proper divisors (12933115).

161365373 is a wasteful number, since it uses less digits than its factorization.

161365373 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37183.

The product of its digits is 34020, while the sum is 35.

The square root of 161365373 is about 12702.9670943445. The cubic root of 161365373 is about 544.4233982594.

The spelling of 161365373 in words is "one hundred sixty-one million, three hundred sixty-five thousand, three hundred seventy-three".