6499925251 has 4 divisors (see below), whose sum is σ = 6842026600. Its totient is φ = 6157823904.

The previous prime is 6499925233. The next prime is 6499925269. The reversal of 6499925251 is 1525299946.

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

It is an interprime number because it is at equal distance from previous prime (6499925233) and next prime (6499925269).

It is a cyclic number.

It is not a de Polignac number, because 6499925251 - 2⁵ = 6499925219 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6499925221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 171050646 + ... + 171050683.

It is an arithmetic number, because the mean of its divisors is an integer number (1710506650).

Almost surely, 2^6499925251 is an apocalyptic number.

6499925251 is a deficient number, since it is larger than the sum of its proper divisors (342101349).

6499925251 is a wasteful number, since it uses less digits than its factorization.

6499925251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 342101348.

The product of its digits is 1749600, while the sum is 52.

The square root of 6499925251 is about 80622.1139080339. The cubic root of 6499925251 is about 1866.2484244972.

The spelling of 6499925251 in words is "six billion, four hundred ninety-nine million, nine hundred twenty-five thousand, two hundred fifty-one".