161310780165 has 8 divisors (see below), whose sum is σ = 258097248288. Its totient is φ = 86032416080.

The previous prime is 161310780161. The next prime is 161310780167. The reversal of 161310780165 is 561087013161.

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

It is not a de Polignac number, because 161310780165 - 2² = 161310780161 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161310780161) 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, 5377025991 + ... + 5377026020.

It is an arithmetic number, because the mean of its divisors is an integer number (32262156036).

Almost surely, 2^161310780165 is an apocalyptic number.

161310780165 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

161310780165 is a deficient number, since it is larger than the sum of its proper divisors (96786468123).

161310780165 is a wasteful number, since it uses less digits than its factorization.

161310780165 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10754052019.

The product of its (nonzero) digits is 30240, while the sum is 39.

The spelling of 161310780165 in words is "one hundred sixty-one billion, three hundred ten million, seven hundred eighty thousand, one hundred sixty-five".