1678326499 has 4 divisors (see below), whose sum is σ = 1682220960. Its totient is φ = 1674432040.

The previous prime is 1678326497. The next prime is 1678326509. The reversal of 1678326499 is 9946238761.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9946238761 = 1013 ⋅9818597.

It is a cyclic number.

It is not a de Polignac number, because 1678326499 - 2¹ = 1678326497 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1678326493) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1946584 + ... + 1947445.

It is an arithmetic number, because the mean of its divisors is an integer number (420555240).

Almost surely, 2^1678326499 is an apocalyptic number.

1678326499 is a deficient number, since it is larger than the sum of its proper divisors (3894461).

1678326499 is an equidigital number, since it uses as much as digits as its factorization.

1678326499 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3894460.

The product of its digits is 3919104, while the sum is 55.

The square root of 1678326499 is about 40967.3833555427. The cubic root of 1678326499 is about 1188.3895308679.

The spelling of 1678326499 in words is "one billion, six hundred seventy-eight million, three hundred twenty-six thousand, four hundred ninety-nine".