6651544249 has 27 divisors (see below), whose sum is σ = 7907835663. Its totient is φ = 5578498800.

The previous prime is 6651544243. The next prime is 6651544283. The reversal of 6651544249 is 9424451566.

The square root of 6651544249 is 81557.

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., 216295849 + 6435248400 = 14707^2 + 80220^2 .

It is not a de Polignac number, because 6651544249 - 2¹⁵ = 6651511481 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 6651544199 and 6651544208.

It is not an unprimeable number, because it can be changed into a prime (6651544243) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 34824744 + ... + 34824934.

Almost surely, 2^6651544249 is an apocalyptic number.

6651544249 is the 81557-th square number.

6651544249 is the 40779-th centered octagonal number.

It is an amenable number.

6651544249 is a deficient number, since it is larger than the sum of its proper divisors (1256291414).

6651544249 is an frugal number, since it uses more digits than its factorization.

6651544249 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 518 (or 259 counting only the distinct ones).

The product of its digits is 1036800, while the sum is 46.

The cubic root of 6651544249 is about 1880.6479064012.

The spelling of 6651544249 in words is "six billion, six hundred fifty-one million, five hundred forty-four thousand, two hundred forty-nine".