161651616 has 96 divisors (see below), whose sum is σ = 487202688. Its totient is φ = 45972480.

The previous prime is 161651603. The next prime is 161651621. The reversal of 161651616 is 616156161.

It is a tau number, because it is divible by the number of its divisors (96).

It is a super-2 number, since 2×161651616² = 52262489910822912, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 196486 + ... + 197306.

It is an arithmetic number, because the mean of its divisors is an integer number (5075028).

Almost surely, 2^161651616 is an apocalyptic number.

161651616 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 161651616, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (243601344).

161651616 is an abundant number, since it is smaller than the sum of its proper divisors (325551072).

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

161651616 is a wasteful number, since it uses less digits than its factorization.

161651616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1134 (or 1126 counting only the distinct ones).

The product of its digits is 6480, while the sum is 33.

The square root of 161651616 is about 12714.2288794877. The cubic root of 161651616 is about 544.7451222429.

The spelling of 161651616 in words is "one hundred sixty-one million, six hundred fifty-one thousand, six hundred sixteen".