161534513611 has 8 divisors (see below), whose sum is σ = 162039134448. Its totient is φ = 161030400000.

The previous prime is 161534513603. The next prime is 161534513639. The reversal of 161534513611 is 116315435161.

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 161534513611 - 2³ = 161534513603 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161534513411) 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, 516196 + ... + 767806.

It is an arithmetic number, because the mean of its divisors is an integer number (20254891806).

Almost surely, 2^161534513611 is an apocalyptic number.

161534513611 is a deficient number, since it is larger than the sum of its proper divisors (504620837).

161534513611 is a wasteful number, since it uses less digits than its factorization.

161534513611 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 253613.

The product of its digits is 32400, while the sum is 37.

Adding to 161534513611 its reverse (116315435161), we get a palindrome (277849948772).

The spelling of 161534513611 in words is "one hundred sixty-one billion, five hundred thirty-four million, five hundred thirteen thousand, six hundred eleven".