161600440531 has 4 divisors (see below), whose sum is σ = 163266424552. Its totient is φ = 159934456512.

The previous prime is 161600440499. The next prime is 161600440549. The reversal of 161600440531 is 135044006161.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 135044006161 = 4007 ⋅33702023.

It is a cyclic number.

It is not a de Polignac number, because 161600440531 - 2⁵ = 161600440499 is a prime.

It is a super-2 number, since 2×161600440531² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 161600440493 and 161600440502.

It is not an unprimeable number, because it can be changed into a prime (161600440831) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 832991865 + ... + 832992058.

It is an arithmetic number, because the mean of its divisors is an integer number (40816606138).

Almost surely, 2^161600440531 is an apocalyptic number.

161600440531 is a deficient number, since it is larger than the sum of its proper divisors (1665984021).

161600440531 is an equidigital number, since it uses as much as digits as its factorization.

161600440531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1665984020.

The product of its (nonzero) digits is 8640, while the sum is 31.

Adding to 161600440531 its reverse (135044006161), we get a palindrome (296644446692).

The spelling of 161600440531 in words is "one hundred sixty-one billion, six hundred million, four hundred forty thousand, five hundred thirty-one".