198454640987 has 8 divisors (see below), whose sum is σ = 215015152176. Its totient is φ = 182437097472.

The previous prime is 198454640983. The next prime is 198454640999. The reversal of 198454640987 is 789046454891.

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

It is a cyclic number.

It is not a de Polignac number, because 198454640987 - 2² = 198454640983 is a prime.

It is not an unprimeable number, because it can be changed into a prime (198454640983) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 135741158 + ... + 135742619.

It is an arithmetic number, because the mean of its divisors is an integer number (26876894022).

Almost surely, 2^198454640987 is an apocalyptic number.

198454640987 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

198454640987 is a deficient number, since it is larger than the sum of its proper divisors (16560511189).

198454640987 is a wasteful number, since it uses less digits than its factorization.

198454640987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 271483837.

The product of its (nonzero) digits is 69672960, while the sum is 65.

The spelling of 198454640987 in words is "one hundred ninety-eight billion, four hundred fifty-four million, six hundred forty thousand, nine hundred eighty-seven".