161000665100 has 36 divisors (see below), whose sum is σ = 381132486168. Its totient is φ = 58545696000.

The previous prime is 161000665079. The next prime is 161000665121. The reversal of 161000665100 is 1566000161.

It is an interprime number because it is at equal distance from previous prime (161000665079) and next prime (161000665121).

It is a self number, because there is not a number n which added to its sum of digits gives 161000665100.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 73181021 + ... + 73183220.

Almost surely, 2^161000665100 is an apocalyptic number.

161000665100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

161000665100 is an abundant number, since it is smaller than the sum of its proper divisors (220131821068).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

161000665100 is a wasteful number, since it uses less digits than its factorization.

161000665100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 146364266 (or 146364259 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 26.

Adding to 161000665100 its reverse (1566000161), we get a palindrome (162566665261).

The spelling of 161000665100 in words is "one hundred sixty-one billion, six hundred sixty-five thousand, one hundred".