8378661559 has 8 divisors (see below), whose sum is σ = 8956194912. Its totient is φ = 7818898560.

The previous prime is 8378661539. The next prime is 8378661611. The reversal of 8378661559 is 9551668738.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 8378661559 - 2⁹ = 8378661047 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8378661539) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4441614 + ... + 4443499.

It is an arithmetic number, because the mean of its divisors is an integer number (1119524364).

Almost surely, 2^8378661559 is an apocalyptic number.

8378661559 is a deficient number, since it is larger than the sum of its proper divisors (577533353).

8378661559 is a wasteful number, since it uses less digits than its factorization.

8378661559 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8885177.

The product of its digits is 10886400, while the sum is 58.

The square root of 8378661559 is about 91535.0291363913. The cubic root of 8378661559 is about 2031.0699593021.

The spelling of 8378661559 in words is "eight billion, three hundred seventy-eight million, six hundred sixty-one thousand, five hundred fifty-nine".