16581680635 has 32 divisors (see below), whose sum is σ = 21981274560. Its totient is φ = 11929958400.

The previous prime is 16581680593. The next prime is 16581680641. The reversal of 16581680635 is 53608618561.

It is not a de Polignac number, because 16581680635 - 2¹¹ = 16581678587 is a prime.

It is a super-2 number, since 2×16581680635² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2152140 + ... + 2159830.

It is an arithmetic number, because the mean of its divisors is an integer number (686914830).

Almost surely, 2^16581680635 is an apocalyptic number.

16581680635 is a deficient number, since it is larger than the sum of its proper divisors (5399593925).

16581680635 is a wasteful number, since it uses less digits than its factorization.

16581680635 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8559.

The product of its (nonzero) digits is 1036800, while the sum is 49.

The spelling of 16581680635 in words is "sixteen billion, five hundred eighty-one million, six hundred eighty thousand, six hundred thirty-five".