666064404420 has 48 divisors (see below), whose sum is σ = 1915385212608. Its totient is φ = 172816709760.

The previous prime is 666064404419. The next prime is 666064404487. The reversal of 666064404420 is 24404460666.

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, 150012286 + ... + 150016725.

It is an arithmetic number, because the mean of its divisors is an integer number (39903858596).

Almost surely, 2^666064404420 is an apocalyptic number.

666064404420 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

666064404420 is an abundant number, since it is smaller than the sum of its proper divisors (1249320808188).

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

666064404420 is a wasteful number, since it uses less digits than its factorization.

666064404420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 300029060 (or 300029058 counting only the distinct ones).

The product of its (nonzero) digits is 663552, while the sum is 42.

The spelling of 666064404420 in words is "six hundred sixty-six billion, sixty-four million, four hundred four thousand, four hundred twenty".