16617251985 has 16 divisors (see below), whose sum is σ = 26589202560. Its totient is φ = 8862001280.

The previous prime is 16617251957. The next prime is 16617252007. The reversal of 16617251985 is 58915271661.

It is not a de Polignac number, because 16617251985 - 2¹¹ = 16617249937 is a prime.

It is a super-2 number, since 2×16617251985² (a number of 21 digits) contains 22 as substring.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 459100 + ... + 493970.

It is an arithmetic number, because the mean of its divisors is an integer number (1661825160).

Almost surely, 2^16617251985 is an apocalyptic number.

16617251985 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

16617251985 is a deficient number, since it is larger than the sum of its proper divisors (9971950575).

16617251985 is a wasteful number, since it uses less digits than its factorization.

16617251985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66648.

The product of its digits is 907200, while the sum is 51.

The spelling of 16617251985 in words is "sixteen billion, six hundred seventeen million, two hundred fifty-one thousand, nine hundred eighty-five".