161646193340 has 24 divisors (see below), whose sum is σ = 340035322032. Its totient is φ = 64548321920.

The previous prime is 161646193337. The next prime is 161646193363. The reversal of 161646193340 is 43391646161.

It is a super-2 number, since 2×161646193340² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 161646193291 and 161646193300.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6872681 + ... + 6896160.

It is an arithmetic number, because the mean of its divisors is an integer number (14168138418).

Almost surely, 2^161646193340 is an apocalyptic number.

161646193340 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

161646193340 is an abundant number, since it is smaller than the sum of its proper divisors (178389128692).

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

161646193340 is a wasteful number, since it uses less digits than its factorization.

161646193340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13769437 (or 13769435 counting only the distinct ones).

The product of its (nonzero) digits is 279936, while the sum is 44.

The spelling of 161646193340 in words is "one hundred sixty-one billion, six hundred forty-six million, one hundred ninety-three thousand, three hundred forty".