194861979780 has 192 divisors, whose sum is σ = 598888442880. Its totient is φ = 47046882816.

The previous prime is 194861979779. The next prime is 194861979857. The reversal of 194861979780 is 87979168491.

It is a super-2 number, since 2×194861979780² (a number of 23 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (69) coincides with the sum of the digits of its prime factors.

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, 21486807 + ... + 21495873.

It is an arithmetic number, because the mean of its divisors is an integer number (3119210640).

Almost surely, 2^194861979780 is an apocalyptic number.

194861979780 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 194861979780, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (299444221440).

194861979780 is an abundant number, since it is smaller than the sum of its proper divisors (404026463100).

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

194861979780 is a wasteful number, since it uses less digits than its factorization.

194861979780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9618 (or 9616 counting only the distinct ones).

The product of its (nonzero) digits is 54867456, while the sum is 69.

The spelling of 194861979780 in words is "one hundred ninety-four billion, eight hundred sixty-one million, nine hundred seventy-nine thousand, seven hundred eighty".