6521551253 has 16 divisors (see below), whose sum is σ = 7618892160. Its totient is φ = 5466617856.

The previous prime is 6521551249. The next prime is 6521551277. The reversal of 6521551253 is 3521551256.

It is not a de Polignac number, because 6521551253 - 2² = 6521551249 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6521556253) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 38801 + ... + 120617.

It is an arithmetic number, because the mean of its divisors is an integer number (476180760).

Almost surely, 2^6521551253 is an apocalyptic number.

It is an amenable number.

6521551253 is a deficient number, since it is larger than the sum of its proper divisors (1097340907).

6521551253 is a wasteful number, since it uses less digits than its factorization.

6521551253 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82076.

The product of its digits is 45000, while the sum is 35.

The square root of 6521551253 is about 80756.1220775243. The cubic root of 6521551253 is about 1868.3158746562.

The spelling of 6521551253 in words is "six billion, five hundred twenty-one million, five hundred fifty-one thousand, two hundred fifty-three".