6542778244 has 6 divisors (see below), whose sum is σ = 11449861934. Its totient is φ = 3271389120.

The previous prime is 6542778241. The next prime is 6542778259. The reversal of 6542778244 is 4428772456.

It can be written as a sum of positive squares in only one way, i.e., 5785427844 + 757350400 = 76062^2 + 27520^2 .

It is not an unprimeable number, because it can be changed into a prime (6542778241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 817847277 + ... + 817847284.

Almost surely, 2^6542778244 is an apocalyptic number.

It is an amenable number.

6542778244 is a deficient number, since it is larger than the sum of its proper divisors (4907083690).

6542778244 is a wasteful number, since it uses less digits than its factorization.

6542778244 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1635694565 (or 1635694563 counting only the distinct ones).

The product of its digits is 3010560, while the sum is 49.

The square root of 6542778244 is about 80887.4418188633. The cubic root of 6542778244 is about 1870.3407391901.

The spelling of 6542778244 in words is "six billion, five hundred forty-two million, seven hundred seventy-eight thousand, two hundred forty-four".