661360998 has 16 divisors (see below), whose sum is σ = 1380231936. Its totient is φ = 210868680.

The previous prime is 661360969. The next prime is 661361003. The reversal of 661360998 is 899063166.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2396098 + ... + 2396373.

It is an arithmetic number, because the mean of its divisors is an integer number (86264496).

Almost surely, 2^661360998 is an apocalyptic number.

661360998 is an abundant number, since it is smaller than the sum of its proper divisors (718870938).

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

661360998 is a wasteful number, since it uses less digits than its factorization.

661360998 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4792499.

The product of its (nonzero) digits is 419904, while the sum is 48.

The square root of 661360998 is about 25716.9399034955. The cubic root of 661360998 is about 871.2568253107.

The spelling of 661360998 in words is "six hundred sixty-one million, three hundred sixty thousand, nine hundred ninety-eight".