6499815125 has 12 divisors (see below), whose sum is σ = 8112894348. Its totient is φ = 5199131000.

The previous prime is 6499815073. The next prime is 6499815131. The reversal of 6499815125 is 5215189946.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

It can be written as a sum of positive squares in 2 ways, for example, as 207994084 + 6291821041 = 14422^2 + 79321^2 .

It is not a de Polignac number, because 6499815125 - 2⁸ = 6499814869 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 897770 + ... + 904980.

It is an arithmetic number, because the mean of its divisors is an integer number (676074529).

Almost surely, 2^6499815125 is an apocalyptic number.

It is an amenable number.

6499815125 is a deficient number, since it is larger than the sum of its proper divisors (1613079223).

6499815125 is an frugal number, since it uses more digits than its factorization.

6499815125 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14437 (or 7216 counting only the distinct ones).

The product of its digits is 777600, while the sum is 50.

The square root of 6499815125 is about 80621.4309287549. The cubic root of 6499815125 is about 1866.2378847024.

The spelling of 6499815125 in words is "six billion, four hundred ninety-nine million, eight hundred fifteen thousand, one hundred twenty-five".