1666783490 has 8 divisors (see below), whose sum is σ = 3000210300. Its totient is φ = 666713392.

The previous prime is 1666783483. The next prime is 1666783519. The reversal of 1666783490 is 943876661.

It can be written as a sum of positive squares in 2 ways, for example, as 1548343801 + 118439689 = 39349^2 + 10883^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 83339165 + ... + 83339184.

Almost surely, 2^1666783490 is an apocalyptic number.

1666783490 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1666783490 is a deficient number, since it is larger than the sum of its proper divisors (1333426810).

1666783490 is a wasteful number, since it uses less digits than its factorization.

1666783490 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 166678356.

The product of its (nonzero) digits is 1306368, while the sum is 50.

The square root of 1666783490 is about 40826.2598090984. The cubic root of 1666783490 is about 1185.6588027249.

The spelling of 1666783490 in words is "one billion, six hundred sixty-six million, seven hundred eighty-three thousand, four hundred ninety".