1678994425 has 12 divisors (see below), whose sum is σ = 2084490220. Its totient is φ = 1341558720.

The previous prime is 1678994417. The next prime is 1678994497. The reversal of 1678994425 is 5244998761.

It can be written as a sum of positive squares in 6 ways, for example, as 266211856 + 1412782569 = 16316^2 + 37587^2 .

It is not a de Polignac number, because 1678994425 - 2³ = 1678994417 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 19782 + ... + 61231.

Almost surely, 2^1678994425 is an apocalyptic number.

It is an amenable number.

1678994425 is a deficient number, since it is larger than the sum of its proper divisors (405495795).

1678994425 is an equidigital number, since it uses as much as digits as its factorization.

1678994425 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81852 (or 81847 counting only the distinct ones).

The product of its digits is 4354560, while the sum is 55.

The square root of 1678994425 is about 40975.5344687534. The cubic root of 1678994425 is about 1188.5471583205.

The spelling of 1678994425 in words is "one billion, six hundred seventy-eight million, nine hundred ninety-four thousand, four hundred twenty-five".