18970720666 has 16 divisors (see below), whose sum is σ = 29820757824. Its totient is φ = 9034008544.

The previous prime is 18970720633. The next prime is 18970720759. The reversal of 18970720666 is 66602707981.

It is a happy number.

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 7 ways as a sum of consecutive naturals, for example, 874276 + ... + 895711.

It is an arithmetic number, because the mean of its divisors is an integer number (1863797364).

Almost surely, 2^18970720666 is an apocalyptic number.

18970720666 is a deficient number, since it is larger than the sum of its proper divisors (10850037158).

18970720666 is a wasteful number, since it uses less digits than its factorization.

18970720666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1770245.

The product of its (nonzero) digits is 1524096, while the sum is 52.

The spelling of 18970720666 in words is "eighteen billion, nine hundred seventy million, seven hundred twenty thousand, six hundred sixty-six".