198023781851 has 16 divisors (see below), whose sum is σ = 229083047424. Its totient is φ = 167657832384.

The previous prime is 198023781829. The next prime is 198023781877. The reversal of 198023781851 is 158187320891.

It is a de Polignac number, because none of the positive numbers 2^k-198023781851 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 198023781793 and 198023781802.

It is not an unprimeable number, because it can be changed into a prime (198023781821) 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, 3330455 + ... + 3389391.

It is an arithmetic number, because the mean of its divisors is an integer number (14317690464).

Almost surely, 2^198023781851 is an apocalyptic number.

198023781851 is a deficient number, since it is larger than the sum of its proper divisors (31059265573).

198023781851 is an equidigital number, since it uses as much as digits as its factorization.

198023781851 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64810.

The product of its (nonzero) digits is 967680, while the sum is 53.

The spelling of 198023781851 in words is "one hundred ninety-eight billion, twenty-three million, seven hundred eighty-one thousand, eight hundred fifty-one".