666986470 has 16 divisors (see below), whose sum is σ = 1214066880. Its totient is φ = 263796544.

The previous prime is 666986443. The next prime is 666986471. The reversal of 666986470 is 74689666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (666986471) 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, 373822 + ... + 375601.

It is an arithmetic number, because the mean of its divisors is an integer number (75879180).

Almost surely, 2^666986470 is an apocalyptic number.

666986470 is a deficient number, since it is larger than the sum of its proper divisors (547080410).

666986470 is a wasteful number, since it uses less digits than its factorization.

666986470 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 749519.

The product of its (nonzero) digits is 2612736, while the sum is 52.

The square root of 666986470 is about 25826.0811971154. The cubic root of 666986470 is about 873.7201293783.

It can be divided in two parts, 6669 and 86470, that added together give a palindrome (93139).

The spelling of 666986470 in words is "six hundred sixty-six million, nine hundred eighty-six thousand, four hundred seventy".