6521001256 has 64 divisors (see below), whose sum is σ = 15598471680. Its totient is φ = 2481554880.

The previous prime is 6521001247. The next prime is 6521001257.

6521001256 is nontrivially palindromic in base 10.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is not an unprimeable number, because it can be changed into a prime (6521001257) 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, 96606 + ... + 149581.

It is an arithmetic number, because the mean of its divisors is an integer number (243726120).

Almost surely, 2^6521001256 is an apocalyptic number.

It is an amenable number.

6521001256 is an abundant number, since it is smaller than the sum of its proper divisors (9077470424).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

6521001256 is a wasteful number, since it uses less digits than its factorization.

6521001256 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 246254 (or 246250 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 28.

The square root of 6521001256 is about 80752.7167097182. The cubic root of 6521001256 is about 1868.2633515180.

It can be divided in two parts, 652100 and 1256, that added together give a palindrome (653356).

The spelling of 6521001256 in words is "six billion, five hundred twenty-one million, one thousand, two hundred fifty-six".