195490388644 has 12 divisors (see below), whose sum is σ = 350064184624. Its totient is φ = 95472050184.

The previous prime is 195490388567. The next prime is 195490388657. The reversal of 195490388644 is 446883094591.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 568285842 + ... + 568286185.

Almost surely, 2^195490388644 is an apocalyptic number.

It is an amenable number.

195490388644 is a deficient number, since it is larger than the sum of its proper divisors (154573795980).

195490388644 is a wasteful number, since it uses less digits than its factorization.

195490388644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1136572074 (or 1136572072 counting only the distinct ones).

The product of its (nonzero) digits is 29859840, while the sum is 61.

The spelling of 195490388644 in words is "one hundred ninety-five billion, four hundred ninety million, three hundred eighty-eight thousand, six hundred forty-four".