16501797650 has 24 divisors (see below), whose sum is σ = 33054371364. Its totient is φ = 6092971200.

The previous prime is 16501797617. The next prime is 16501797661. The reversal of 16501797650 is 5679710561.

It can be written as a sum of positive squares in 6 ways, for example, as 8462344081 + 8039453569 = 91991^2 + 89663^2 .

It is a junction number, because it is equal to n+sod(n) for n = 16501797595 and 16501797604.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 12693041 + ... + 12694340.

Almost surely, 2^16501797650 is an apocalyptic number.

16501797650 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

16501797650 is an abundant number, since it is smaller than the sum of its proper divisors (16552573714).

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

16501797650 is a wasteful number, since it uses less digits than its factorization.

16501797650 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25387406 (or 25387401 counting only the distinct ones).

The product of its (nonzero) digits is 396900, while the sum is 47.

The spelling of 16501797650 in words is "sixteen billion, five hundred one million, seven hundred ninety-seven thousand, six hundred fifty".