161032561535 has 4 divisors (see below), whose sum is σ = 193239073848. Its totient is φ = 128826049224.

The previous prime is 161032561507. The next prime is 161032561553. The reversal of 161032561535 is 535165230161.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 161032561535 - 2⁶ = 161032561471 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, 16103256149 + ... + 16103256158.

It is an arithmetic number, because the mean of its divisors is an integer number (48309768462).

Almost surely, 2^161032561535 is an apocalyptic number.

161032561535 is a deficient number, since it is larger than the sum of its proper divisors (32206512313).

161032561535 is an equidigital number, since it uses as much as digits as its factorization.

161032561535 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32206512312.

The product of its (nonzero) digits is 81000, while the sum is 38.

Adding to 161032561535 its reverse (535165230161), we get a palindrome (696197791696).

The spelling of 161032561535 in words is "one hundred sixty-one billion, thirty-two million, five hundred sixty-one thousand, five hundred thirty-five".