7868883661 has 4 divisors (see below), whose sum is σ = 7869109500. Its totient is φ = 7868657824.

The previous prime is 7868883629. The next prime is 7868883677. The reversal of 7868883661 is 1663888687.

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 5246829225 + 2622054436 = 72435^2 + 51206^2 .

It is a cyclic number.

It is not a de Polignac number, because 7868883661 - 2⁵ = 7868883629 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 7868883661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7868883601) 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, 48346 + ... + 134443.

It is an arithmetic number, because the mean of its divisors is an integer number (1967277375).

Almost surely, 2^7868883661 is an apocalyptic number.

It is an amenable number.

7868883661 is a deficient number, since it is larger than the sum of its proper divisors (225839).

7868883661 is a wasteful number, since it uses less digits than its factorization.

7868883661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 225838.

The product of its digits is 18579456, while the sum is 61.

The square root of 7868883661 is about 88706.7283862955. The cubic root of 7868883661 is about 1989.0133961970.

The spelling of 7868883661 in words is "seven billion, eight hundred sixty-eight million, eight hundred eighty-three thousand, six hundred sixty-one".