195159977640 has 112 divisors (see below), whose sum is σ = 658363850100. Its totient is φ = 52042652928.

The previous prime is 195159977627. The next prime is 195159977641. The reversal of 195159977640 is 46779951591.

195159977640 is a `hidden beast` number, since 1 + 9 + 515 + 9 + 9 + 7 + 76 + 40 = 666.

195159977640 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 189104959044 + 6055018596 = 434862^2 + 77814^2 .

It is not an unprimeable number, because it can be changed into a prime (195159977641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 3317205 + ... + 3375524.

Almost surely, 2^195159977640 is an apocalyptic number.

195159977640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

195159977640 is an abundant number, since it is smaller than the sum of its proper divisors (463203872460).

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

195159977640 is an equidigital number, since it uses as much as digits as its factorization.

195159977640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6692758 (or 6692739 counting only the distinct ones).

The product of its (nonzero) digits is 21432600, while the sum is 63.

The spelling of 195159977640 in words is "one hundred ninety-five billion, one hundred fifty-nine million, nine hundred seventy-seven thousand, six hundred forty".