666663279420 has 48 divisors (see below), whose sum is σ = 1897258130208. Its totient is φ = 174862498560.

The previous prime is 666663279383. The next prime is 666663279433. The reversal of 666663279420 is 24972366666.

It is a Smith number, since the sum of its digits (57) coincides with the sum of the digits of its prime factors.

It is a congruent 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, 91070559 + ... + 91077878.

It is an arithmetic number, because the mean of its divisors is an integer number (39526211046).

Almost surely, 2^666663279420 is an apocalyptic number.

666663279420 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

666663279420 is an abundant number, since it is smaller than the sum of its proper divisors (1230594850788).

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

666663279420 is a wasteful number, since it uses less digits than its factorization.

666663279420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 182148510 (or 182148508 counting only the distinct ones).

The product of its (nonzero) digits is 23514624, while the sum is 57.

The spelling of 666663279420 in words is "six hundred sixty-six billion, six hundred sixty-three million, two hundred seventy-nine thousand, four hundred twenty".