161343893490 has 128 divisors (see below), whose sum is σ = 428557409280. Its totient is φ = 38617233408.

The previous prime is 161343893479. The next prime is 161343893509. The reversal of 161343893490 is 94398343161.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 32998966 + ... + 33003854.

It is an arithmetic number, because the mean of its divisors is an integer number (3348104760).

Almost surely, 2^161343893490 is an apocalyptic number.

161343893490 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 161343893490, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (214278704640).

161343893490 is an abundant number, since it is smaller than the sum of its proper divisors (267213515790).

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

161343893490 is a wasteful number, since it uses less digits than its factorization.

161343893490 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7236.

The product of its (nonzero) digits is 1679616, while the sum is 51.

The spelling of 161343893490 in words is "one hundred sixty-one billion, three hundred forty-three million, eight hundred ninety-three thousand, four hundred ninety".