16231878198 has 20 divisors (see below), whose sum is σ = 36371431140. Its totient is φ = 5410626012.

The previous prime is 16231878197. The next prime is 16231878199. The reversal of 16231878198 is 89187813261.

16231878198 is a `hidden beast` number, since 1 + 623 + 1 + 8 + 7 + 8 + 1 + 9 + 8 = 666.

It is an interprime number because it is at equal distance from previous prime (16231878197) and next prime (16231878199).

It is a Smith number, since the sum of its digits (54) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16231878191) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 50098228 + ... + 50098551.

It is an arithmetic number, because the mean of its divisors is an integer number (1818571557).

Almost surely, 2^16231878198 is an apocalyptic number.

16231878198 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

16231878198 is an abundant number, since it is smaller than the sum of its proper divisors (20139552942).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

16231878198 is a wasteful number, since it uses less digits than its factorization.

16231878198 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 100196793 (or 100196784 counting only the distinct ones).

The product of its digits is 1161216, while the sum is 54.

The spelling of 16231878198 in words is "sixteen billion, two hundred thirty-one million, eight hundred seventy-eight thousand, one hundred ninety-eight".