660981406 has 16 divisors (see below), whose sum is σ = 1042735104. Its totient is φ = 313629624.

The previous prime is 660981401. The next prime is 660981439. The reversal of 660981406 is 604189066.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (660981401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 50730 + ... + 62413.

It is an arithmetic number, because the mean of its divisors is an integer number (65170944).

Almost surely, 2^660981406 is an apocalyptic number.

660981406 is a deficient number, since it is larger than the sum of its proper divisors (381753698).

660981406 is a wasteful number, since it uses less digits than its factorization.

660981406 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 113295.

The product of its (nonzero) digits is 62208, while the sum is 40.

The square root of 660981406 is about 25709.5586504319. The cubic root of 660981406 is about 871.0901057655.

The spelling of 660981406 in words is "six hundred sixty million, nine hundred eighty-one thousand, four hundred six".