661358298 has 8 divisors (see below), whose sum is σ = 1322716608. Its totient is φ = 220452764.

The previous prime is 661358287. The next prime is 661358363. The reversal of 661358298 is 892853166.

It is a happy number.

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

661358298 is an admirable number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 55113186 + ... + 55113197.

It is an arithmetic number, because the mean of its divisors is an integer number (165339576).

Almost surely, 2^661358298 is an apocalyptic number.

661358298 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

661358298 is a wasteful number, since it uses less digits than its factorization.

661358298 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 110226388.

The product of its digits is 622080, while the sum is 48.

The square root of 661358298 is about 25716.8874088603. The cubic root of 661358298 is about 871.2556396765.

The spelling of 661358298 in words is "six hundred sixty-one million, three hundred fifty-eight thousand, two hundred ninety-eight".