6647249307076 has 81 divisors (see below), whose sum is σ = 13761929876877. Its totient is φ = 2801190984480.

The previous prime is 6647249307043. The next prime is 6647249307089. The reversal of 6647249307076 is 6707039427466.

The square root of 6647249307076 is 2578226.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 216156185476 + 6431093121600 = 464926^2 + 2535960^2 .

It is a Harshad number since it is a multiple of its sum of digits (61).

It is an unprimeable number.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 2201803495 + ... + 2201806513.

Almost surely, 2^{6647249307076} is an apocalyptic number.

6647249307076 is the 2578226-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6647249307076

6647249307076 is an abundant number, since it is smaller than the sum of its proper divisors (7114680569801).

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

6647249307076 is an frugal number, since it uses more digits than its factorization.

6647249307076 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6178 (or 3089 counting only the distinct ones).

The product of its (nonzero) digits is 64012032, while the sum is 61.

The spelling of 6647249307076 in words is "six trillion, six hundred forty-seven billion, two hundred forty-nine million, three hundred seven thousand, seventy-six".