161648818992 has 200 divisors, whose sum is σ = 487394737280. Its totient is φ = 51664988160.

The previous prime is 161648818987. The next prime is 161648818993. The reversal of 161648818992 is 299818846161.

161648818992 is a `hidden beast` number, since 1 + 61 + 6 + 488 + 1 + 8 + 9 + 92 = 666.

It is a super-2 number, since 2×161648818992² (a number of 23 digits) contains 22 as substring.

It is a nude number because it is divisible by every one of its digits.

It is not an unprimeable number, because it can be changed into a prime (161648818993) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 4360728 + ... + 4397640.

Almost surely, 2^161648818992 is an apocalyptic number.

161648818992 is a gapful number since it is divisible by the number (12) 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 161648818992, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (243697368640).

161648818992 is an abundant number, since it is smaller than the sum of its proper divisors (325745918288).

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

161648818992 is a wasteful number, since it uses less digits than its factorization.

161648818992 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37073 (or 37058 counting only the distinct ones).

The product of its digits is 11943936, while the sum is 63.

The spelling of 161648818992 in words is "one hundred sixty-one billion, six hundred forty-eight million, eight hundred eighteen thousand, nine hundred ninety-two".