6420024666 has 48 divisors (see below), whose sum is σ = 15423396768. Its totient is φ = 1913565600.

The previous prime is 6420024629. The next prime is 6420024691. The reversal of 6420024666 is 6664200246.

It is a self number, because there is not a number n which added to its sum of digits gives 6420024666.

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, 253696 + ... + 277851.

It is an arithmetic number, because the mean of its divisors is an integer number (321320766).

Almost surely, 2^6420024666 is an apocalyptic number.

6420024666 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

6420024666 is an abundant number, since it is smaller than the sum of its proper divisors (9003372102).

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

6420024666 is a wasteful number, since it uses less digits than its factorization.

6420024666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 531627 (or 531624 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 36.

The square root of 6420024666 is about 80125.0564180769. The cubic root of 6420024666 is about 1858.5698979414.

The spelling of 6420024666 in words is "six billion, four hundred twenty million, twenty-four thousand, six hundred sixty-six".