1678145866 has 8 divisors (see below), whose sum is σ = 2517697764. Its totient is φ = 838913280.

The previous prime is 1678145863. The next prime is 1678145893. The reversal of 1678145866 is 6685418761.

It can be written as a sum of positive squares in 2 ways, for example, as 1678131225 + 14641 = 40965^2 + 121^2 .

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

It is not an unprimeable number, because it can be changed into a prime (1678145863) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 66225 + ... + 87988.

Almost surely, 2^1678145866 is an apocalyptic number.

1678145866 is a deficient number, since it is larger than the sum of its proper divisors (839551898).

1678145866 is a wasteful number, since it uses less digits than its factorization.

1678145866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 159656.

The product of its digits is 1935360, while the sum is 52.

The square root of 1678145866 is about 40965.1787009406. The cubic root of 1678145866 is about 1188.3468951297.

The spelling of 1678145866 in words is "one billion, six hundred seventy-eight million, one hundred forty-five thousand, eight hundred sixty-six".