6425020666 has 16 divisors (see below), whose sum is σ = 9736738848. Its totient is φ = 3179466000.

The previous prime is 6425020663. The next prime is 6425020691. The reversal of 6425020666 is 6660205246.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (6425020663) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 731521 + ... + 740251.

It is an arithmetic number, because the mean of its divisors is an integer number (608546178).

Almost surely, 2^6425020666 is an apocalyptic number.

6425020666 is a deficient number, since it is larger than the sum of its proper divisors (3311718182).

6425020666 is a wasteful number, since it uses less digits than its factorization.

6425020666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12477.

The product of its (nonzero) digits is 103680, while the sum is 37.

The square root of 6425020666 is about 80156.2266202695. The cubic root of 6425020666 is about 1859.0518798718.

The spelling of 6425020666 in words is "six billion, four hundred twenty-five million, twenty thousand, six hundred sixty-six".