198834870787 has 16 divisors (see below), whose sum is σ = 229651736832. Its totient is φ = 168623359200.

The previous prime is 198834870761. The next prime is 198834870803. The reversal of 198834870787 is 787078438891.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-198834870787 is a prime.

It is not an unprimeable number, because it can be changed into a prime (198834870187) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 910348 + ... + 1107430.

It is an arithmetic number, because the mean of its divisors is an integer number (14353233552).

Almost surely, 2^198834870787 is an apocalyptic number.

198834870787 is a deficient number, since it is larger than the sum of its proper divisors (30816866045).

198834870787 is a wasteful number, since it uses less digits than its factorization.

198834870787 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 198618.

The product of its (nonzero) digits is 151732224, while the sum is 70.

The spelling of 198834870787 in words is "one hundred ninety-eight billion, eight hundred thirty-four million, eight hundred seventy thousand, seven hundred eighty-seven".