161243673408 has 224 divisors, whose sum is σ = 495317068800. Its totient is φ = 51340303872.

The previous prime is 161243673377. The next prime is 161243673457. The reversal of 161243673408 is 804376342161.

161243673408 is a `hidden beast` number, since 1 + 6 + 1 + 243 + 67 + 340 + 8 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 34137735 + ... + 34142457.

Almost surely, 2^161243673408 is an apocalyptic number.

161243673408 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 161243673408, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (247658534400).

161243673408 is an abundant number, since it is smaller than the sum of its proper divisors (334073395392).

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

161243673408 is a wasteful number, since it uses less digits than its factorization.

161243673408 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5626 (or 5610 counting only the distinct ones).

The product of its (nonzero) digits is 580608, while the sum is 45.

The spelling of 161243673408 in words is "one hundred sixty-one billion, two hundred forty-three million, six hundred seventy-three thousand, four hundred eight".