6395601778 has 4 divisors (see below), whose sum is σ = 9593402670. Its totient is φ = 3197800888.

The previous prime is 6395601757. The next prime is 6395601787. The reversal of 6395601778 is 8771065936.

6395601778 is digitally balanced in base 5, 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 only one way, i.e., 4595890849 + 1799710929 = 67793^2 + 42423^2 .

It is a super-2 number, since 2×6395601778² = 81807444205513522568, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1598900443 + ... + 1598900446.

Almost surely, 2^6395601778 is an apocalyptic number.

6395601778 is a deficient number, since it is larger than the sum of its proper divisors (3197800892).

6395601778 is a wasteful number, since it uses less digits than its factorization.

6395601778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3197800891.

The product of its (nonzero) digits is 1905120, while the sum is 52.

The square root of 6395601778 is about 79972.5063881332. The cubic root of 6395601778 is about 1856.2101289369.

The spelling of 6395601778 in words is "six billion, three hundred ninety-five million, six hundred one thousand, seven hundred seventy-eight".