6420666510 has 24 divisors (see below), whose sum is σ = 16693733160. Its totient is φ = 1712177712.

The previous prime is 6420666493. The next prime is 6420666517. The reversal of 6420666510 is 156660246.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6420666517) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 35670280 + ... + 35670459.

It is an arithmetic number, because the mean of its divisors is an integer number (695572215).

Almost surely, 2^6420666510 is an apocalyptic number.

6420666510 is an abundant number, since it is smaller than the sum of its proper divisors (10273066650).

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

6420666510 is a wasteful number, since it uses less digits than its factorization.

6420666510 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71340752 (or 71340749 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 36.

The square root of 6420666510 is about 80129.0615819254. The cubic root of 6420666510 is about 1858.6318329156.

The spelling of 6420666510 in words is "six billion, four hundred twenty million, six hundred sixty-six thousand, five hundred ten".