161801701516 has 96 divisors (see below), whose sum is σ = 373667696640. Its totient is φ = 59481437184.

The previous prime is 161801701469. The next prime is 161801701531. The reversal of 161801701516 is 615107108161.

It is a super-2 number, since 2×161801701516² (a number of 23 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 323361 + ... + 654343.

It is an arithmetic number, because the mean of its divisors is an integer number (3892371840).

Almost surely, 2^161801701516 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 161801701516, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (186833848320).

161801701516 is an abundant number, since it is smaller than the sum of its proper divisors (211865995124).

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

161801701516 is a wasteful number, since it uses less digits than its factorization.

161801701516 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 331103 (or 331101 counting only the distinct ones).

The product of its (nonzero) digits is 10080, while the sum is 37.

Adding to 161801701516 its reverse (615107108161), we get a palindrome (776908809677).

The spelling of 161801701516 in words is "one hundred sixty-one billion, eight hundred one million, seven hundred one thousand, five hundred sixteen".