1666481770 has 16 divisors (see below), whose sum is σ = 3069427680. Its totient is φ = 651090384.

The previous prime is 1666481759. The next prime is 1666481783. The reversal of 1666481770 is 771846661.

It is a super-2 number, since 2×1666481770² = 5554322979484665800, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1666481770.

It is an unprimeable number.

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, 1937340 + ... + 1938199.

It is an arithmetic number, because the mean of its divisors is an integer number (191839230).

Almost surely, 2^1666481770 is an apocalyptic number.

1666481770 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1666481770 is a deficient number, since it is larger than the sum of its proper divisors (1402945910).

1666481770 is a wasteful number, since it uses less digits than its factorization.

1666481770 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3875589.

The product of its (nonzero) digits is 338688, while the sum is 46.

The square root of 1666481770 is about 40822.5644711353. The cubic root of 1666481770 is about 1185.5872560276.

The spelling of 1666481770 in words is "one billion, six hundred sixty-six million, four hundred eighty-one thousand, seven hundred seventy".