161600505 has 32 divisors (see below), whose sum is σ = 284888448. Its totient is φ = 77568000.

The previous prime is 161600503. The next prime is 161600531. The reversal of 161600505 is 505006161.

It is not a de Polignac number, because 161600505 - 2¹ = 161600503 is a prime.

It is a super-2 number, since 2×161600505² = 52229446432510050, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (161600501) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 11817 + ... + 21513.

It is an arithmetic number, because the mean of its divisors is an integer number (8902764).

Almost surely, 2^161600505 is an apocalyptic number.

161600505 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

161600505 is a deficient number, since it is larger than the sum of its proper divisors (123287943).

161600505 is a wasteful number, since it uses less digits than its factorization.

161600505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9817.

The product of its (nonzero) digits is 900, while the sum is 24.

The square root of 161600505 is about 12712.2187284518. The cubic root of 161600505 is about 544.6877036956.

Adding to 161600505 its reverse (505006161), we get a palindrome (666606666).

The spelling of 161600505 in words is "one hundred sixty-one million, six hundred thousand, five hundred five".