161216812 has 12 divisors (see below), whose sum is σ = 282237480. Its totient is φ = 80577536.

The previous prime is 161216779. The next prime is 161216819. The reversal of 161216812 is 218612161.

It is not an unprimeable number, because it can be changed into a prime (161216819) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7263 + ... + 19369.

It is an arithmetic number, because the mean of its divisors is an integer number (23519790).

Almost surely, 2^161216812 is an apocalyptic number.

It is an amenable number.

161216812 is a deficient number, since it is larger than the sum of its proper divisors (121020668).

161216812 is a wasteful number, since it uses less digits than its factorization.

161216812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15440 (or 15438 counting only the distinct ones).

The product of its digits is 1152, while the sum is 28.

The square root of 161216812 is about 12697.1182557303. The cubic root of 161216812 is about 544.2562725280.

Adding to 161216812 its reverse (218612161), we get a palindrome (379828973).

The spelling of 161216812 in words is "one hundred sixty-one million, two hundred sixteen thousand, eight hundred twelve".