16618321602 has 36 divisors (see below), whose sum is σ = 36292744566. Its totient is φ = 5495726880.

The previous prime is 16618321571. The next prime is 16618321607. The reversal of 16618321602 is 20612381661.

It is a happy number.

16618321602 is a `hidden beast` number, since 1 + 6 + 6 + 18 + 32 + 1 + 602 = 666.

It can be written as a sum of positive squares in only one way, i.e., 15712371801 + 905949801 = 125349^2 + 30099^2 .

It is a super-2 number, since 2×16618321602² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (16618321607) 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, 261702 + ... + 318942.

Almost surely, 2^16618321602 is an apocalyptic number.

16618321602 is an abundant number, since it is smaller than the sum of its proper divisors (19674422964).

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

16618321602 is a wasteful number, since it uses less digits than its factorization.

16618321602 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57503 (or 57373 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 36.

The spelling of 16618321602 in words is "sixteen billion, six hundred eighteen million, three hundred twenty-one thousand, six hundred two".