195903491566 has 16 divisors (see below), whose sum is σ = 313229041200. Its totient is φ = 91571152000.

The previous prime is 195903491527. The next prime is 195903491587. The reversal of 195903491566 is 665194309591.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 195903491566.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19330060 + ... + 19340191.

It is an arithmetic number, because the mean of its divisors is an integer number (19576815075).

Almost surely, 2^195903491566 is an apocalyptic number.

195903491566 is a deficient number, since it is larger than the sum of its proper divisors (117325549634).

195903491566 is a wasteful number, since it uses less digits than its factorization.

195903491566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38670419.

The product of its (nonzero) digits is 7873200, while the sum is 58.

The spelling of 195903491566 in words is "one hundred ninety-five billion, nine hundred three million, four hundred ninety-one thousand, five hundred sixty-six".