198650664087650 has 12 divisors (see below), whose sum is σ = 369490235203122. Its totient is φ = 79460265635040.

The previous prime is 198650664087613. The next prime is 198650664087677. The reversal of 198650664087650 is 56780466056891.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 174173768695081 + 24476895392569 = 13197491^2 + 4947413^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1986506640827 + ... + 1986506640926.

Almost surely, 2^{198650664087650} is an apocalyptic number.

198650664087650 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

198650664087650 is a deficient number, since it is larger than the sum of its proper divisors (170839571115472).

198650664087650 is a wasteful number, since it uses less digits than its factorization.

198650664087650 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3973013281765 (or 3973013281760 counting only the distinct ones).

The product of its (nonzero) digits is 522547200, while the sum is 71.

The spelling of 198650664087650 in words is "one hundred ninety-eight trillion, six hundred fifty billion, six hundred sixty-four million, eighty-seven thousand, six hundred fifty".