161502653365 has 4 divisors (see below), whose sum is σ = 193803184044. Its totient is φ = 129202122688.

The previous prime is 161502653353. The next prime is 161502653401. The reversal of 161502653365 is 563356205161.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 563356205161 = 63697 ⋅8844313.

It can be written as a sum of positive squares in 2 ways, for example, as 68546570596 + 92956082769 = 261814^2 + 304887^2 .

It is a cyclic number.

It is not a de Polignac number, because 161502653365 - 2³³ = 152912718773 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16150265332 + ... + 16150265341.

It is an arithmetic number, because the mean of its divisors is an integer number (48450796011).

Almost surely, 2^161502653365 is an apocalyptic number.

It is an amenable number.

161502653365 is a deficient number, since it is larger than the sum of its proper divisors (32300530679).

161502653365 is an equidigital number, since it uses as much as digits as its factorization.

161502653365 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32300530678.

The product of its (nonzero) digits is 486000, while the sum is 43.

The spelling of 161502653365 in words is "one hundred sixty-one billion, five hundred two million, six hundred fifty-three thousand, three hundred sixty-five".