8378664581895 has 16 divisors (see below), whose sum is σ = 13406197469280. Its totient is φ = 4468509730944.

The previous prime is 8378664581891. The next prime is 8378664581899. The reversal of 8378664581895 is 5981854668738.

It is an interprime number because it is at equal distance from previous prime (8378664581891) and next prime (8378664581899).

It is not a de Polignac number, because 8378664581895 - 2² = 8378664581891 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 8378664581895.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8378664581891) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6337540 + ... + 7544649.

It is an arithmetic number, because the mean of its divisors is an integer number (837887341830).

Almost surely, 2^{8378664581895} is an apocalyptic number.

8378664581895 is a deficient number, since it is larger than the sum of its proper divisors (5027532887385).

8378664581895 is a wasteful number, since it uses less digits than its factorization.

8378664581895 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13922434.

The product of its digits is 2786918400, while the sum is 78.

The spelling of 8378664581895 in words is "eight trillion, three hundred seventy-eight billion, six hundred sixty-four million, five hundred eighty-one thousand, eight hundred ninety-five".