16698591450 has 120 divisors (see below), whose sum is σ = 46667496348. Its totient is φ = 4427032320.

The previous prime is 16698591449. The next prime is 16698591487. The reversal of 16698591450 is 5419589661.

16698591450 is a `hidden beast` number, since 1 + 6 + 6 + 9 + 8 + 591 + 45 + 0 = 666.

It can be written as a sum of positive squares in 6 ways, for example, as 13268966481 + 3429624969 = 115191^2 + 58563^2 .

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 an unprimeable number.

It is a polite number, since it can be written in 59 ways as a sum of consecutive naturals, for example, 688734 + ... + 712566.

Almost surely, 2^16698591450 is an apocalyptic number.

16698591450 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 16698591450, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23333748174).

16698591450 is an abundant number, since it is smaller than the sum of its proper divisors (29968904898).

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

16698591450 is a wasteful number, since it uses less digits than its factorization.

16698591450 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24030 (or 24016 counting only the distinct ones).

The product of its (nonzero) digits is 2332800, while the sum is 54.

The spelling of 16698591450 in words is "sixteen billion, six hundred ninety-eight million, five hundred ninety-one thousand, four hundred fifty".