198549690685 has 8 divisors (see below), whose sum is σ = 238262114016. Its totient is φ = 158838095760.

The previous prime is 198549690683. The next prime is 198549690719. The reversal of 198549690685 is 586096945891.

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

It is not a de Polignac number, because 198549690685 - 2¹ = 198549690683 is a prime.

It is a super-2 number, since 2×198549690685² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (198549690683) 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, 621790 + ... + 885280.

It is an arithmetic number, because the mean of its divisors is an integer number (29782764252).

Almost surely, 2^198549690685 is an apocalyptic number.

It is an amenable number.

198549690685 is a deficient number, since it is larger than the sum of its proper divisors (39712423331).

198549690685 is a wasteful number, since it uses less digits than its factorization.

198549690685 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 414203.

The product of its (nonzero) digits is 167961600, while the sum is 70.

The spelling of 198549690685 in words is "one hundred ninety-eight billion, five hundred forty-nine million, six hundred ninety thousand, six hundred eighty-five".