4778649818 has 4 divisors (see below), whose sum is σ = 7167974730. Its totient is φ = 2389324908.

The previous prime is 4778649791. The next prime is 4778649839. The reversal of 4778649818 is 8189468774.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 8189468774 = 2 ⋅4094734387.

It can be written as a sum of positive squares in only one way, i.e., 4170188929 + 608460889 = 64577^2 + 24667^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1194662453 + ... + 1194662456.

Almost surely, 2^4778649818 is an apocalyptic number.

4778649818 is a deficient number, since it is larger than the sum of its proper divisors (2389324912).

4778649818 is a wasteful number, since it uses less digits than its factorization.

4778649818 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2389324911.

The product of its digits is 21676032, while the sum is 62.

The square root of 4778649818 is about 69127.7789170171. The cubic root of 4778649818 is about 1684.3605797924.

The spelling of 4778649818 in words is "four billion, seven hundred seventy-eight million, six hundred forty-nine thousand, eight hundred eighteen".