161005615 has 8 divisors (see below), whose sum is σ = 195120288. Its totient is φ = 127528800.

The previous prime is 161005613. The next prime is 161005619. The reversal of 161005615 is 516500161.

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

It is not a de Polignac number, because 161005615 - 2¹ = 161005613 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 161005615.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161005613) 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, 158907 + ... + 159916.

It is an arithmetic number, because the mean of its divisors is an integer number (24390036).

Almost surely, 2^161005615 is an apocalyptic number.

161005615 is a deficient number, since it is larger than the sum of its proper divisors (34114673).

161005615 is a wasteful number, since it uses less digits than its factorization.

161005615 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 318929.

The product of its (nonzero) digits is 900, while the sum is 25.

The square root of 161005615 is about 12688.7988005169. The cubic root of 161005615 is about 544.0185067504.

Adding to 161005615 its reverse (516500161), we get a palindrome (677505776).

The spelling of 161005615 in words is "one hundred sixty-one million, five thousand, six hundred fifteen".