8195254778 has 4 divisors (see below), whose sum is σ = 12292882170. Its totient is φ = 4097627388.

The previous prime is 8195254741. The next prime is 8195254841. The reversal of 8195254778 is 8774525918.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 8774525918 = 2 ⋅4387262959.

It can be written as a sum of positive squares in only one way, i.e., 8054524009 + 140730769 = 89747^2 + 11863^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2048813693 + ... + 2048813696.

Almost surely, 2^8195254778 is an apocalyptic number.

8195254778 is a deficient number, since it is larger than the sum of its proper divisors (4097627392).

8195254778 is a wasteful number, since it uses less digits than its factorization.

8195254778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4097627391.

The product of its digits is 5644800, while the sum is 56.

The square root of 8195254778 is about 90527.6464843751. The cubic root of 8195254778 is about 2016.1406212602.

The spelling of 8195254778 in words is "eight billion, one hundred ninety-five million, two hundred fifty-four thousand, seven hundred seventy-eight".