6455221515 has 24 divisors (see below), whose sum is σ = 11675532960. Its totient is φ = 3293097984.

The previous prime is 6455221477. The next prime is 6455221529. The reversal of 6455221515 is 5151225546.

6455221515 is a `hidden beast` number, since 645 + 5 + 2 + 2 + 1 + 5 + 1 + 5 = 666.

It is not a de Polignac number, because 6455221515 - 2⁷ = 6455221387 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 6455221515.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3117430 + ... + 3119499.

It is an arithmetic number, because the mean of its divisors is an integer number (486480540).

Almost surely, 2^6455221515 is an apocalyptic number.

6455221515 is a deficient number, since it is larger than the sum of its proper divisors (5220311445).

6455221515 is a wasteful number, since it uses less digits than its factorization.

6455221515 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6236963 (or 6236960 counting only the distinct ones).

The product of its digits is 60000, while the sum is 36.

The square root of 6455221515 is about 80344.3931771222. The cubic root of 6455221515 is about 1861.9601560803.

The spelling of 6455221515 in words is "six billion, four hundred fifty-five million, two hundred twenty-one thousand, five hundred fifteen".