6521257013 has 8 divisors (see below), whose sum is σ = 6558750528. Its totient is φ = 6483865824.

The previous prime is 6521256991. The next prime is 6521257021. The reversal of 6521257013 is 3107521256.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 6521257013 - 2¹² = 6521252917 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6521250013) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 104120 + ... + 154542.

It is an arithmetic number, because the mean of its divisors is an integer number (819843816).

Almost surely, 2^6521257013 is an apocalyptic number.

It is an amenable number.

6521257013 is a deficient number, since it is larger than the sum of its proper divisors (37493515).

6521257013 is a wasteful number, since it uses less digits than its factorization.

6521257013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51163.

The product of its (nonzero) digits is 12600, while the sum is 32.

The square root of 6521257013 is about 80754.3002755890. The cubic root of 6521257013 is about 1868.2877759463.

Adding to 6521257013 its reverse (3107521256), we get a palindrome (9628778269).

The spelling of 6521257013 in words is "six billion, five hundred twenty-one million, two hundred fifty-seven thousand, thirteen".