1666720005002 has 32 divisors (see below), whose sum is σ = 2869230131712. Its totient is φ = 720153967104.

The previous prime is 1666720004993. The next prime is 1666720005053. The reversal of 1666720005002 is 2005000276661.

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, 29622503 + ... + 29678714.

It is an arithmetic number, because the mean of its divisors is an integer number (89663441616).

Almost surely, 2^{1666720005002} is an apocalyptic number.

1666720005002 is a deficient number, since it is larger than the sum of its proper divisors (1202510126710).

1666720005002 is a wasteful number, since it uses less digits than its factorization.

1666720005002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59301302.

The product of its (nonzero) digits is 30240, while the sum is 35.

The spelling of 1666720005002 in words is "one trillion, six hundred sixty-six billion, seven hundred twenty million, five thousand, two".