161405043401616 has 60 divisors (see below), whose sum is σ = 485038625331312. Its totient is φ = 46115726685504.

The previous prime is 161405043401579. The next prime is 161405043401621. The reversal of 161405043401616 is 616104340504161.

It is a super-2 number, since 2×161405043401616² (a number of 29 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 34312294290 + ... + 34312298993.

Almost surely, 2^{161405043401616} is an apocalyptic number.

161405043401616 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

161405043401616 is an abundant number, since it is smaller than the sum of its proper divisors (323633581929696).

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

161405043401616 is a wasteful number, since it uses less digits than its factorization.

161405043401616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68624593308 (or 68624593295 counting only the distinct ones).

The product of its (nonzero) digits is 207360, while the sum is 42.

Adding to 161405043401616 its reverse (616104340504161), we get a palindrome (777509383905777).

The spelling of 161405043401616 in words is "one hundred sixty-one trillion, four hundred five billion, forty-three million, four hundred one thousand, six hundred sixteen".