195925551905 has 16 divisors (see below), whose sum is σ = 249344237520. Its totient is φ = 147281283072.

The previous prime is 195925551853. The next prime is 195925551929. The reversal of 195925551905 is 509155529591.

It can be written as a sum of positive squares in 8 ways, for example, as 1398685201 + 194526866704 = 37399^2 + 441052^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-195925551905 is a prime.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1815470 + ... + 1920359.

It is an arithmetic number, because the mean of its divisors is an integer number (15584014845).

Almost surely, 2^195925551905 is an apocalyptic number.

It is an amenable number.

195925551905 is a deficient number, since it is larger than the sum of its proper divisors (53418685615).

195925551905 is a wasteful number, since it uses less digits than its factorization.

195925551905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3736468.

The product of its (nonzero) digits is 4556250, while the sum is 56.

The spelling of 195925551905 in words is "one hundred ninety-five billion, nine hundred twenty-five million, five hundred fifty-one thousand, nine hundred five".