16509135798 has 32 divisors (see below), whose sum is σ = 36840499200. Its totient is φ = 5480015688.

The previous prime is 16509135793. The next prime is 16509135803. The reversal of 16509135798 is 89753190561.

16509135798 is a `hidden beast` number, since 1 + 6 + 50 + 9 + 13 + 579 + 8 = 666.

It is an interprime number because it is at equal distance from previous prime (16509135793) and next prime (16509135803).

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

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16509135793) 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, 626686 + ... + 652497.

It is an arithmetic number, because the mean of its divisors is an integer number (1151265600).

Almost surely, 2^16509135798 is an apocalyptic number.

16509135798 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

16509135798 is an abundant number, since it is smaller than the sum of its proper divisors (20331363402).

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

16509135798 is a wasteful number, since it uses less digits than its factorization.

16509135798 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1279433 (or 1279427 counting only the distinct ones).

The product of its (nonzero) digits is 2041200, while the sum is 54.

The spelling of 16509135798 in words is "sixteen billion, five hundred nine million, one hundred thirty-five thousand, seven hundred ninety-eight".