161601616016 has 10 divisors (see below), whose sum is σ = 313103131062. Its totient is φ = 80800808000.

The previous prime is 161601616003. The next prime is 161601616049. The reversal of 161601616016 is 610616106161.

It can be written as a sum of positive squares in only one way, i.e., 153100038400 + 8501577616 = 391280^2 + 92204^2 .

It is a super-2 number, since 2×161601616016² (a number of 23 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5050050485 + ... + 5050050516.

Almost surely, 2^161601616016 is an apocalyptic number.

161601616016 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

161601616016 is a deficient number, since it is larger than the sum of its proper divisors (151501515046).

161601616016 is a wasteful number, since it uses less digits than its factorization.

161601616016 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10100101009 (or 10100101003 counting only the distinct ones).

The product of its (nonzero) digits is 7776, while the sum is 35.

The spelling of 161601616016 in words is "one hundred sixty-one billion, six hundred one million, six hundred sixteen thousand, sixteen".