6499925249 has 4 divisors (see below), whose sum is σ = 6510066180. Its totient is φ = 6489784320.

The previous prime is 6499925233. The next prime is 6499925269. The reversal of 6499925249 is 9425299946.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 6214484224 + 285441025 = 78832^2 + 16895^2 .

It is a cyclic number.

It is not a de Polignac number, because 6499925249 - 2⁴ = 6499925233 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (6499925219) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5069504 + ... + 5070785.

It is an arithmetic number, because the mean of its divisors is an integer number (1627516545).

Almost surely, 2^6499925249 is an apocalyptic number.

It is an amenable number.

6499925249 is a deficient number, since it is larger than the sum of its proper divisors (10140931).

6499925249 is a wasteful number, since it uses less digits than its factorization.

6499925249 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10140930.

The product of its digits is 12597120, while the sum is 59.

The square root of 6499925249 is about 80622.1138956304. The cubic root of 6499925249 is about 1866.2484243058.

The spelling of 6499925249 in words is "six billion, four hundred ninety-nine million, nine hundred twenty-five thousand, two hundred forty-nine".