6420137515 has 16 divisors (see below), whose sum is σ = 8441261280. Its totient is φ = 4648792320.

The previous prime is 6420137491. The next prime is 6420137527. The reversal of 6420137515 is 5157310246.

It is not a de Polignac number, because 6420137515 - 2²⁹ = 5883266603 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 242274 + ... + 267463.

It is an arithmetic number, because the mean of its divisors is an integer number (527578830).

Almost surely, 2^6420137515 is an apocalyptic number.

6420137515 is a deficient number, since it is larger than the sum of its proper divisors (2021123765).

6420137515 is a wasteful number, since it uses less digits than its factorization.

6420137515 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 509982.

The product of its (nonzero) digits is 25200, while the sum is 34.

The square root of 6420137515 is about 80125.7606204147. The cubic root of 6420137515 is about 1858.5807876465.

The spelling of 6420137515 in words is "six billion, four hundred twenty million, one hundred thirty-seven thousand, five hundred fifteen".