1668812782 has 16 divisors (see below), whose sum is σ = 3080885472. Its totient is φ = 660189600.

The previous prime is 1668812773. The next prime is 1668812833. The reversal of 1668812782 is 2872188661.

It is a super-2 number, since 2×1668812782² = 5569872202733159048, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4584469 + ... + 4584832.

It is an arithmetic number, because the mean of its divisors is an integer number (192555342).

Almost surely, 2^1668812782 is an apocalyptic number.

1668812782 is a deficient number, since it is larger than the sum of its proper divisors (1412072690).

1668812782 is a wasteful number, since it uses less digits than its factorization.

1668812782 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9169323.

The product of its digits is 516096, while the sum is 49.

The square root of 1668812782 is about 40851.1050278937. The cubic root of 1668812782 is about 1186.1397834384.

The spelling of 1668812782 in words is "one billion, six hundred sixty-eight million, eight hundred twelve thousand, seven hundred eighty-two".