1666371290 has 16 divisors (see below), whose sum is σ = 3026988360. Its totient is φ = 660432960.

The previous prime is 1666371283. The next prime is 1666371293. The reversal of 1666371290 is 921736661.

It can be written as a sum of positive squares in 4 ways, for example, as 1126877761 + 539493529 = 33569^2 + 23227^2 .

It is a super-2 number, since 2×1666371290² = 5553586552272528200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1666371293) 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, 763301 + ... + 765480.

Almost surely, 2^1666371290 is an apocalyptic number.

1666371290 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1666371290 is a deficient number, since it is larger than the sum of its proper divisors (1360617070).

1666371290 is a wasteful number, since it uses less digits than its factorization.

1666371290 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1528897.

The product of its (nonzero) digits is 81648, while the sum is 41.

The square root of 1666371290 is about 40821.2112755121. The cubic root of 1666371290 is about 1185.5610558060.

It can be divided in two parts, 1666371 and 290, that added together give a palindrome (1666661).

The spelling of 1666371290 in words is "one billion, six hundred sixty-six million, three hundred seventy-one thousand, two hundred ninety".