6451968066 has 32 divisors (see below), whose sum is σ = 13016282688. Its totient is φ = 2131995840.

The previous prime is 6451968037. The next prime is 6451968071. The reversal of 6451968066 is 6608691546.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 409576 + ... + 425036.

It is an arithmetic number, because the mean of its divisors is an integer number (406758834).

Almost surely, 2^6451968066 is an apocalyptic number.

6451968066 is an abundant number, since it is smaller than the sum of its proper divisors (6564314622).

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

6451968066 is a wasteful number, since it uses less digits than its factorization.

6451968066 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16066.

The product of its (nonzero) digits is 1866240, while the sum is 51.

The square root of 6451968066 is about 80324.1437302633. The cubic root of 6451968066 is about 1861.6472925381.

The spelling of 6451968066 in words is "six billion, four hundred fifty-one million, nine hundred sixty-eight thousand, sixty-six".