161016815 has 4 divisors (see below), whose sum is σ = 193220184. Its totient is φ = 128813448.

The previous prime is 161016797. The next prime is 161016893. The reversal of 161016815 is 518610161.

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 161016815 - 2²⁶ = 93907951 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, 16101677 + ... + 16101686.

It is an arithmetic number, because the mean of its divisors is an integer number (48305046).

Almost surely, 2^161016815 is an apocalyptic number.

161016815 is a deficient number, since it is larger than the sum of its proper divisors (32203369).

161016815 is an equidigital number, since it uses as much as digits as its factorization.

161016815 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32203368.

The product of its (nonzero) digits is 1440, while the sum is 29.

The square root of 161016815 is about 12689.2401269737. The cubic root of 161016815 is about 544.0311209398.

Adding to 161016815 its reverse (518610161), we get a palindrome (679626976).

The spelling of 161016815 in words is "one hundred sixty-one million, sixteen thousand, eight hundred fifteen".