1658563998 has 256 divisors, whose sum is σ = 4596480000. Its totient is φ = 386684928.

The previous prime is 1658563967. The next prime is 1658564009. The reversal of 1658563998 is 8993658561.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 11131228 + ... + 11131376.

It is an arithmetic number, because the mean of its divisors is an integer number (17955000).

Almost surely, 2^1658563998 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1658563998, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2298240000).

1658563998 is an abundant number, since it is smaller than the sum of its proper divisors (2937916002).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1658563998 is a wasteful number, since it uses less digits than its factorization.

1658563998 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 259.

The product of its digits is 13996800, while the sum is 60.

The square root of 1658563998 is about 40725.4711206635. The cubic root of 1658563998 is about 1183.7066242436.

It can be divided in two parts, 1658563 and 998, that added together give a palindrome (1659561).

The spelling of 1658563998 in words is "one billion, six hundred fifty-eight million, five hundred sixty-three thousand, nine hundred ninety-eight".