1678111745 has 4 divisors (see below), whose sum is σ = 2013734100. Its totient is φ = 1342489392.

The previous prime is 1678111733. The next prime is 1678111751. The reversal of 1678111745 is 5471118761.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1290533776 + 387577969 = 35924^2 + 19687^2 .

It is a cyclic number.

It is not a de Polignac number, because 1678111745 - 2⁸ = 1678111489 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 167811170 + ... + 167811179.

It is an arithmetic number, because the mean of its divisors is an integer number (503433525).

Almost surely, 2^1678111745 is an apocalyptic number.

It is an amenable number.

1678111745 is a deficient number, since it is larger than the sum of its proper divisors (335622355).

1678111745 is an equidigital number, since it uses as much as digits as its factorization.

1678111745 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 335622354.

The product of its digits is 47040, while the sum is 41.

The square root of 1678111745 is about 40964.7622353652. The cubic root of 1678111745 is about 1188.3388410307.

The spelling of 1678111745 in words is "one billion, six hundred seventy-eight million, one hundred eleven thousand, seven hundred forty-five".