16663601700 has 54 divisors (see below), whose sum is σ = 52231136594. Its totient is φ = 4443626880.

The previous prime is 16663601663. The next prime is 16663601701. The reversal of 16663601700 is 710636661.

It can be written as a sum of positive squares in 3 ways, for example, as 4937310756 + 11726290944 = 70266^2 + 108288^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (16663601701) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 9256657 + ... + 9258456.

Almost surely, 2^16663601700 is an apocalyptic number.

16663601700 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

16663601700 is an abundant number, since it is smaller than the sum of its proper divisors (35567534894).

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

16663601700 is a wasteful number, since it uses less digits than its factorization.

16663601700 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18515133 (or 18515123 counting only the distinct ones).

The product of its (nonzero) digits is 27216, while the sum is 36.

The spelling of 16663601700 in words is "sixteen billion, six hundred sixty-three million, six hundred one thousand, seven hundred".