161228890065 has 8 divisors (see below), whose sum is σ = 257966224128. Its totient is φ = 85988741360.

The previous prime is 161228890057. The next prime is 161228890079. The reversal of 161228890065 is 560098822161.

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

It is not a de Polignac number, because 161228890065 - 2³ = 161228890057 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 161228889996 and 161228890023.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5374296321 + ... + 5374296350.

It is an arithmetic number, because the mean of its divisors is an integer number (32245778016).

Almost surely, 2^161228890065 is an apocalyptic number.

161228890065 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

161228890065 is a deficient number, since it is larger than the sum of its proper divisors (96737334063).

161228890065 is a wasteful number, since it uses less digits than its factorization.

161228890065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10748592679.

The product of its (nonzero) digits is 414720, while the sum is 48.

The spelling of 161228890065 in words is "one hundred sixty-one billion, two hundred twenty-eight million, eight hundred ninety thousand, sixty-five".