498198661 has 4 divisors (see below), whose sum is σ = 498976524. Its totient is φ = 497420800.

The previous prime is 498198643. The next prime is 498198671. The reversal of 498198661 is 166891894.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 225750625 + 272448036 = 15025^2 + 16506^2 .

It is a cyclic number.

It is not a de Polignac number, because 498198661 - 2⁹ = 498198149 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 498198599 and 498198608.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (498198611) 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, 387970 + ... + 389251.

It is an arithmetic number, because the mean of its divisors is an integer number (124744131).

Almost surely, 2^498198661 is an apocalyptic number.

It is an amenable number.

498198661 is a deficient number, since it is larger than the sum of its proper divisors (777863).

498198661 is an equidigital number, since it uses as much as digits as its factorization.

498198661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 777862.

The product of its digits is 746496, while the sum is 52.

The square root of 498198661 is about 22320.3642667408. The cubic root of 498198661 is about 792.7462299166.

The spelling of 498198661 in words is "four hundred ninety-eight million, one hundred ninety-eight thousand, six hundred sixty-one".