1678145893 has 2 divisors, whose sum is σ = 1678145894. Its totient is φ = 1678145892.

The previous prime is 1678145863. The next prime is 1678145897. The reversal of 1678145893 is 3985418761.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1643653764 + 34492129 = 40542^2 + 5873^2 .

It is a cyclic number.

It is not a de Polignac number, because 1678145893 - 2²⁵ = 1644591461 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1678145893.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1678145897) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 839072946 + 839072947.

It is an arithmetic number, because the mean of its divisors is an integer number (839072947).

Almost surely, 2^1678145893 is an apocalyptic number.

It is an amenable number.

1678145893 is a deficient number, since it is larger than the sum of its proper divisors (1).

1678145893 is an equidigital number, since it uses as much as digits as its factorization.

1678145893 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1451520, while the sum is 52.

The square root of 1678145893 is about 40965.1790304888. The cubic root of 1678145893 is about 1188.3469015029.

The spelling of 1678145893 in words is "one billion, six hundred seventy-eight million, one hundred forty-five thousand, eight hundred ninety-three".