161516970 has 64 divisors (see below), whose sum is σ = 438877440. Its totient is φ = 42254784.

The previous prime is 161516969. The next prime is 161516989. The reversal of 161516970 is 79615161.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 8667 + ... + 19953.

It is an arithmetic number, because the mean of its divisors is an integer number (6857460).

Almost surely, 2^161516970 is an apocalyptic number.

161516970 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 161516970, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (219438720).

161516970 is an abundant number, since it is smaller than the sum of its proper divisors (277360470).

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

161516970 is a wasteful number, since it uses less digits than its factorization.

161516970 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11356 (or 11350 counting only the distinct ones).

The product of its (nonzero) digits is 11340, while the sum is 36.

The square root of 161516970 is about 12708.9326853202. The cubic root of 161516970 is about 544.5938336720.

The spelling of 161516970 in words is "one hundred sixty-one million, five hundred sixteen thousand, nine hundred seventy".