659998381 has 8 divisors (see below), whose sum is σ = 757579520. Its totient is φ = 563241168.

The previous prime is 659998349. The next prime is 659998387. The reversal of 659998381 is 183899956.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 659998381 - 2⁵ = 659998349 is a prime.

It is a super-2 number, since 2×659998381² = 871195725845242322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (659998387) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 204261 + ... + 207466.

It is an arithmetic number, because the mean of its divisors is an integer number (94697440).

Almost surely, 2^659998381 is an apocalyptic number.

It is an amenable number.

659998381 is a deficient number, since it is larger than the sum of its proper divisors (97581139).

659998381 is a wasteful number, since it uses less digits than its factorization.

659998381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 411963.

The product of its digits is 4199040, while the sum is 58.

The square root of 659998381 is about 25690.4336475662. The cubic root of 659998381 is about 870.6580571993.

The spelling of 659998381 in words is "six hundred fifty-nine million, nine hundred ninety-eight thousand, three hundred eighty-one".