1666027490 has 32 divisors (see below), whose sum is σ = 3114566640. Its totient is φ = 641101824.

The previous prime is 1666027481. The next prime is 1666027501. The reversal of 1666027490 is 947206661.

It is a Cunningham number, because it is equal to 40817²+1.

It can be written as a sum of positive squares in 8 ways, for example, as 802079041 + 863948449 = 28321^2 + 29393^2 .

It is a Curzon number.

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 15 ways as a sum of consecutive naturals, for example, 7634 + ... + 58226.

Almost surely, 2^1666027490 is an apocalyptic number.

1666027490 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1666027490 is a deficient number, since it is larger than the sum of its proper divisors (1448539150).

1666027490 is a wasteful number, since it uses less digits than its factorization.

1666027490 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50726.

The product of its (nonzero) digits is 108864, while the sum is 41.

The square root of 1666027490 is about 40817.0000122498. Note that the first 4 decimals coincide. The cubic root of 1666027490 is about 1185.4795165701.

The spelling of 1666027490 in words is "one billion, six hundred sixty-six million, twenty-seven thousand, four hundred ninety".