161343640 has 16 divisors (see below), whose sum is σ = 363023280. Its totient is φ = 64537440.

The previous prime is 161343613. The next prime is 161343641. The reversal of 161343640 is 46343161.

161343640 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 161343599 and 161343608.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161343641) 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, 2016756 + ... + 2016835.

It is an arithmetic number, because the mean of its divisors is an integer number (22688955).

Almost surely, 2^161343640 is an apocalyptic number.

161343640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

161343640 is an abundant number, since it is smaller than the sum of its proper divisors (201679640).

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

161343640 is a wasteful number, since it uses less digits than its factorization.

161343640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4033602 (or 4033598 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 28.

The square root of 161343640 is about 12702.1116354723. Note that the first 3 decimals coincide. The cubic root of 161343640 is about 544.3989558305.

The spelling of 161343640 in words is "one hundred sixty-one million, three hundred forty-three thousand, six hundred forty".