206605486978 has 16 divisors (see below), whose sum is σ = 341567087904. Its totient is φ = 92943423360.

The previous prime is 206605486939. The next prime is 206605487009. The reversal of 206605486978 is 879684506602.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 48405900 + ... + 48410167.

It is an arithmetic number, because the mean of its divisors is an integer number (21347942994).

Almost surely, 2^206605486978 is an apocalyptic number.

206605486978 is a deficient number, since it is larger than the sum of its proper divisors (134961600926).

206605486978 is a wasteful number, since it uses less digits than its factorization.

206605486978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 96816177.

The product of its (nonzero) digits is 34836480, while the sum is 61.

The spelling of 206605486978 in words is "two hundred six billion, six hundred five million, four hundred eighty-six thousand, nine hundred seventy-eight".