6420505215 has 16 divisors (see below), whose sum is σ = 10346716800. Its totient is φ = 3399633312.

The previous prime is 6420505207. The next prime is 6420505219. The reversal of 6420505215 is 5125050246.

It is not a de Polignac number, because 6420505215 - 2³ = 6420505207 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6420505219) 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, 1537605 + ... + 1541774.

It is an arithmetic number, because the mean of its divisors is an integer number (646669800).

Almost surely, 2^6420505215 is an apocalyptic number.

6420505215 is a deficient number, since it is larger than the sum of its proper divisors (3926211585).

6420505215 is a wasteful number, since it uses less digits than its factorization.

6420505215 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3079526.

The product of its (nonzero) digits is 12000, while the sum is 30.

The square root of 6420505215 is about 80128.0551055621. The cubic root of 6420505215 is about 1858.6162690832.

The spelling of 6420505215 in words is "six billion, four hundred twenty million, five hundred five thousand, two hundred fifteen".