190913778641 has 4 divisors (see below), whose sum is σ = 202144000932. Its totient is φ = 179683556352.

The previous prime is 190913778617. The next prime is 190913778683. The reversal of 190913778641 is 146877319091.

190913778641 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 can be written as a sum of positive squares in 2 ways, for example, as 159157113025 + 31756665616 = 398945^2 + 178204^2 .

It is a cyclic number.

It is not a de Polignac number, because 190913778641 - 2¹⁰ = 190913777617 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (190913378641) 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 3 ways as a sum of consecutive naturals, for example, 5615111120 + ... + 5615111153.

It is an arithmetic number, because the mean of its divisors is an integer number (50536000233).

Almost surely, 2^190913778641 is an apocalyptic number.

It is an amenable number.

190913778641 is a deficient number, since it is larger than the sum of its proper divisors (11230222291).

190913778641 is a wasteful number, since it uses less digits than its factorization.

190913778641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11230222290.

The product of its (nonzero) digits is 2286144, while the sum is 56.

The spelling of 190913778641 in words is "one hundred ninety billion, nine hundred thirteen million, seven hundred seventy-eight thousand, six hundred forty-one".