6553438778 has 4 divisors (see below), whose sum is σ = 9830158170. Its totient is φ = 3276719388.

The previous prime is 6553438741. The next prime is 6553438813. The reversal of 6553438778 is 8778343556.

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., 5236982689 + 1316456089 = 72367^2 + 36283^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1638359693 + ... + 1638359696.

Almost surely, 2^6553438778 is an apocalyptic number.

6553438778 is a deficient number, since it is larger than the sum of its proper divisors (3276719392).

6553438778 is a wasteful number, since it uses less digits than its factorization.

6553438778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3276719391.

The product of its digits is 16934400, while the sum is 56.

The square root of 6553438778 is about 80953.3123349502. The cubic root of 6553438778 is about 1871.3560067579.

The spelling of 6553438778 in words is "six billion, five hundred fifty-three million, four hundred thirty-eight thousand, seven hundred seventy-eight".