1598166985 has 4 divisors (see below), whose sum is σ = 1917800388. Its totient is φ = 1278533584.

The previous prime is 1598166971. The next prime is 1598167001. The reversal of 1598166985 is 5896618951.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5896618951 = 23 ⋅256374737.

It can be written as a sum of positive squares in 2 ways, for example, as 874503184 + 723663801 = 29572^2 + 26901^2 .

It is a cyclic number.

It is not a de Polignac number, because 1598166985 - 2⁹ = 1598166473 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 159816694 + ... + 159816703.

It is an arithmetic number, because the mean of its divisors is an integer number (479450097).

Almost surely, 2^1598166985 is an apocalyptic number.

It is an amenable number.

1598166985 is a deficient number, since it is larger than the sum of its proper divisors (319633403).

1598166985 is an equidigital number, since it uses as much as digits as its factorization.

1598166985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 319633402.

The product of its digits is 4665600, while the sum is 58.

The square root of 1598166985 is about 39977.0807463477. The cubic root of 1598166985 is about 1169.1602772471.

The spelling of 1598166985 in words is "one billion, five hundred ninety-eight million, one hundred sixty-six thousand, nine hundred eighty-five".