195778893904 has 40 divisors (see below), whose sum is σ = 420589107360. Its totient is φ = 87531542400.

The previous prime is 195778893899. The next prime is 195778893943. The reversal of 195778893904 is 409398877591.

It is a super-2 number, since 2×195778893904² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9107134 + ... + 9128605.

It is an arithmetic number, because the mean of its divisors is an integer number (10514727684).

Almost surely, 2^195778893904 is an apocalyptic number.

It is an amenable number.

195778893904 is an abundant number, since it is smaller than the sum of its proper divisors (224810213456).

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

195778893904 is a wasteful number, since it uses less digits than its factorization.

195778893904 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18235819 (or 18235813 counting only the distinct ones).

The product of its (nonzero) digits is 137168640, while the sum is 70.

The spelling of 195778893904 in words is "one hundred ninety-five billion, seven hundred seventy-eight million, eight hundred ninety-three thousand, nine hundred four".