195138663 has 4 divisors (see below), whose sum is σ = 260184888. Its totient is φ = 130092440.

The previous prime is 195138661. The next prime is 195138673. The reversal of 195138663 is 366831591.

It is a happy number.

195138663 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 195138663 - 2¹ = 195138661 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (195138661) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 32523108 + ... + 32523113.

It is an arithmetic number, because the mean of its divisors is an integer number (65046222).

Almost surely, 2^195138663 is an apocalyptic number.

195138663 is a deficient number, since it is larger than the sum of its proper divisors (65046225).

195138663 is an equidigital number, since it uses as much as digits as its factorization.

195138663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65046224.

The product of its digits is 116640, while the sum is 42.

The square root of 195138663 is about 13969.2040932904. The cubic root of 195138663 is about 580.0264187332.

The spelling of 195138663 in words is "one hundred ninety-five million, one hundred thirty-eight thousand, six hundred sixty-three".