1668751047 has 6 divisors (see below), whose sum is σ = 2410418192. Its totient is φ = 1112500692.

The previous prime is 1668751037. The next prime is 1668751061. The reversal of 1668751047 is 7401578661.

1668751047 is a `hidden beast` number, since 16 + 6 + 87 + 510 + 47 = 666.

It is not a de Polignac number, because 1668751047 - 2¹⁰ = 1668750023 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1668750993 and 1668751011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1668751037) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 92708383 + ... + 92708400.

Almost surely, 2^1668751047 is an apocalyptic number.

1668751047 is a deficient number, since it is larger than the sum of its proper divisors (741667145).

1668751047 is a wasteful number, since it uses less digits than its factorization.

1668751047 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 185416789 (or 185416786 counting only the distinct ones).

The product of its (nonzero) digits is 282240, while the sum is 45.

The square root of 1668751047 is about 40850.3494109904. The cubic root of 1668751047 is about 1186.1251568242.

The spelling of 1668751047 in words is "one billion, six hundred sixty-eight million, seven hundred fifty-one thousand, forty-seven".