161894259648 has 504 divisors, whose sum is σ = 545539031856. Its totient is φ = 45705707520.

The previous prime is 161894259629. The next prime is 161894259661. The reversal of 161894259648 is 846952498161.

161894259648 is a `hidden beast` number, since 1 + 6 + 1 + 89 + 425 + 96 + 48 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 126776386 + ... + 126777662.

It is an arithmetic number, because the mean of its divisors is an integer number (1082418714).

Almost surely, 2^161894259648 is an apocalyptic number.

161894259648 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 161894259648, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (272769515928).

161894259648 is an abundant number, since it is smaller than the sum of its proper divisors (383644772208).

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

161894259648 is a wasteful number, since it uses less digits than its factorization.

161894259648 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1441 (or 1417 counting only the distinct ones).

The product of its digits is 29859840, while the sum is 63.

The spelling of 161894259648 in words is "one hundred sixty-one billion, eight hundred ninety-four million, two hundred fifty-nine thousand, six hundred forty-eight".