720211656666 has 32 divisors (see below), whose sum is σ = 1493109964800. Its totient is φ = 231354249840.

The previous prime is 720211656653. The next prime is 720211656679. The reversal of 720211656666 is 666656112027.

It is an interprime number because it is at equal distance from previous prime (720211656653) and next prime (720211656679).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8056186 + ... + 8145093.

It is an arithmetic number, because the mean of its divisors is an integer number (46659686400).

Almost surely, 2^720211656666 is an apocalyptic number.

720211656666 is an abundant number, since it is smaller than the sum of its proper divisors (772898308134).

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

720211656666 is a wasteful number, since it uses less digits than its factorization.

720211656666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16201554.

The product of its (nonzero) digits is 1088640, while the sum is 48.

The spelling of 720211656666 in words is "seven hundred twenty billion, two hundred eleven million, six hundred fifty-six thousand, six hundred sixty-six".