666365145420 has 48 divisors (see below), whose sum is σ = 2009347210080. Its totient is φ = 164028343296.

The previous prime is 666365145401. The next prime is 666365145463. The reversal of 666365145420 is 24541563666.

It is a self number, because there is not a number n which added to its sum of digits gives 666365145420.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 427156365 + ... + 427157924.

It is an arithmetic number, because the mean of its divisors is an integer number (41861400210).

Almost surely, 2^666365145420 is an apocalyptic number.

666365145420 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

666365145420 is an abundant number, since it is smaller than the sum of its proper divisors (1342982064660).

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

666365145420 is a wasteful number, since it uses less digits than its factorization.

666365145420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 854314314 (or 854314312 counting only the distinct ones).

The product of its (nonzero) digits is 3110400, while the sum is 48.

The spelling of 666365145420 in words is "six hundred sixty-six billion, three hundred sixty-five million, one hundred forty-five thousand, four hundred twenty".