16991834450 has 24 divisors (see below), whose sum is σ = 32201134308. Its totient is φ = 6668492480.

The previous prime is 16991834413. The next prime is 16991834459. The reversal of 16991834450 is 5443819961.

It can be written as a sum of positive squares in 6 ways, for example, as 12942930289 + 4048904161 = 113767^2 + 63631^2 .

It is a Harshad number since it is a multiple of its sum of digits (50).

It is not an unprimeable number, because it can be changed into a prime (16991834459) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3203357 + ... + 3208656.

Almost surely, 2^16991834450 is an apocalyptic number.

16991834450 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

16991834450 is a deficient number, since it is larger than the sum of its proper divisors (15209299858).

16991834450 is a wasteful number, since it uses less digits than its factorization.

16991834450 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6412078 (or 6412073 counting only the distinct ones).

The product of its (nonzero) digits is 933120, while the sum is 50.

The spelling of 16991834450 in words is "sixteen billion, nine hundred ninety-one million, eight hundred thirty-four thousand, four hundred fifty".