6649557792 has 48 divisors (see below), whose sum is σ = 17460207072. Its totient is φ = 2215869440.

The previous prime is 6649557787. The next prime is 6649557793. The reversal of 6649557792 is 2977559466.

It is a tau number, because it is divible by the number of its divisors (48).

It is not an unprimeable number, because it can be changed into a prime (6649557793) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 408367 + ... + 424337.

It is an arithmetic number, because the mean of its divisors is an integer number (363754314).

Almost surely, 2^6649557792 is an apocalyptic number.

It is an amenable number.

6649557792 is an abundant number, since it is smaller than the sum of its proper divisors (10810649280).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

6649557792 is a wasteful number, since it uses less digits than its factorization.

6649557792 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20321 (or 20313 counting only the distinct ones).

The product of its digits is 28576800, while the sum is 60.

The square root of 6649557792 is about 81544.8207552141. The cubic root of 6649557792 is about 1880.4606717774.

The spelling of 6649557792 in words is "six billion, six hundred forty-nine million, five hundred fifty-seven thousand, seven hundred ninety-two".