16638086898 has 48 divisors (see below), whose sum is σ = 38183961816. Its totient is φ = 5217845760.

The previous prime is 16638086897. The next prime is 16638086987. The reversal of 16638086898 is 89868083661.

16638086898 is a `hidden beast` number, since 166 + 380 + 8 + 6 + 8 + 98 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 13166874009 + 3471212889 = 114747^2 + 58917^2 .

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (16638086897) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 964840 + ... + 981932.

Almost surely, 2^16638086898 is an apocalyptic number.

16638086898 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

16638086898 is an abundant number, since it is smaller than the sum of its proper divisors (21545874918).

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

16638086898 is a wasteful number, since it uses less digits than its factorization.

16638086898 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20299 (or 20296 counting only the distinct ones).

The product of its (nonzero) digits is 23887872, while the sum is 63.

The spelling of 16638086898 in words is "sixteen billion, six hundred thirty-eight million, eighty-six thousand, eight hundred ninety-eight".