6340253521 has 6 divisors (see below), whose sum is σ = 7375397010. Its totient is φ = 5434502976.

The previous prime is 6340253519. The next prime is 6340253527. The reversal of 6340253521 is 1253520436.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 6340140625 + 112896 = 79625^2 + 336^2 .

It is not a de Polignac number, because 6340253521 - 2¹ = 6340253519 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6340253527) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 64696416 + ... + 64696513.

It is an arithmetic number, because the mean of its divisors is an integer number (1229232835).

Almost surely, 2^6340253521 is an apocalyptic number.

It is an amenable number.

6340253521 is a deficient number, since it is larger than the sum of its proper divisors (1035143489).

6340253521 is a wasteful number, since it uses less digits than its factorization.

6340253521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 129392943 (or 129392936 counting only the distinct ones).

The product of its (nonzero) digits is 21600, while the sum is 31.

The square root of 6340253521 is about 79625.7089199211. The cubic root of 6340253521 is about 1850.8399906904.

Adding to 6340253521 its reverse (1253520436), we get a palindrome (7593773957).

The spelling of 6340253521 in words is "six billion, three hundred forty million, two hundred fifty-three thousand, five hundred twenty-one".