6521121264 has 40 divisors (see below), whose sum is σ = 19252835200. Its totient is φ = 1863177408.

The previous prime is 6521121263. The next prime is 6521121287. The reversal of 6521121264 is 4621211256.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6521121263) 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, 9703714 + ... + 9704385.

It is an arithmetic number, because the mean of its divisors is an integer number (481320880).

Almost surely, 2^6521121264 is an apocalyptic number.

It is an amenable number.

6521121264 is an abundant number, since it is smaller than the sum of its proper divisors (12731713936).

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

6521121264 is a wasteful number, since it uses less digits than its factorization.

6521121264 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19408117 (or 19408111 counting only the distinct ones).

The product of its digits is 5760, while the sum is 30.

The square root of 6521121264 is about 80753.4597648918. The cubic root of 6521121264 is about 1868.2748121902.

The spelling of 6521121264 in words is "six billion, five hundred twenty-one million, one hundred twenty-one thousand, two hundred sixty-four".