194991881280 has 224 divisors, whose sum is σ = 708382900224. Its totient is φ = 44516603904.

The previous prime is 194991881261. The next prime is 194991881311. The reversal of 194991881280 is 82188199491.

It is a tau number, because it is divible by the number of its divisors (224).

It is a super-2 number, since 2×194991881280² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (60).

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, 5782549 + ... + 5816171.

Almost surely, 2^194991881280 is an apocalyptic number.

194991881280 is a gapful number since it is divisible by the number (10) 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 194991881280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (354191450112).

194991881280 is an abundant number, since it is smaller than the sum of its proper divisors (513391018944).

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

194991881280 is a wasteful number, since it uses less digits than its factorization.

194991881280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34513 (or 34503 counting only the distinct ones).

The product of its (nonzero) digits is 2985984, while the sum is 60.

The spelling of 194991881280 in words is "one hundred ninety-four billion, nine hundred ninety-one million, eight hundred eighty-one thousand, two hundred eighty".