6521738125 has 80 divisors (see below), whose sum is σ = 9958812160. Its totient is φ = 4169880000.

The previous prime is 6521738117. The next prime is 6521738143. The reversal of 6521738125 is 5218371256.

It is not a de Polignac number, because 6521738125 - 2³ = 6521738117 is a prime.

It is a super-3 number, since 3×6521738125³ (a number of 30 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

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 79 ways as a sum of consecutive naturals, for example, 5568790 + ... + 5569960.

It is an arithmetic number, because the mean of its divisors is an integer number (124485152).

Almost surely, 2^6521738125 is an apocalyptic number.

It is an amenable number.

6521738125 is a deficient number, since it is larger than the sum of its proper divisors (3437074035).

6521738125 is a wasteful number, since it uses less digits than its factorization.

6521738125 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1284 (or 1269 counting only the distinct ones).

The product of its digits is 100800, while the sum is 40.

The square root of 6521738125 is about 80757.2790836838. The cubic root of 6521738125 is about 1868.3337197249. Note that the first 3 decimals are identical.

The spelling of 6521738125 in words is "six billion, five hundred twenty-one million, seven hundred thirty-eight thousand, one hundred twenty-five".