16601615985 has 16 divisors (see below), whose sum is σ = 26569509120. Its totient is φ = 8851887360.

The previous prime is 16601615963. The next prime is 16601616007. The reversal of 16601615985 is 58951610661.

It is an interprime number because it is at equal distance from previous prime (16601615963) and next prime (16601616007).

It is not a de Polignac number, because 16601615985 - 2¹² = 16601611889 is a prime.

It is a super-2 number, since 2×16601615985² (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 15 ways as a sum of consecutive naturals, for example, 83961 + ... + 200630.

It is an arithmetic number, because the mean of its divisors is an integer number (1660594320).

Almost surely, 2^16601615985 is an apocalyptic number.

16601615985 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

16601615985 is a deficient number, since it is larger than the sum of its proper divisors (9967893135).

16601615985 is a wasteful number, since it uses less digits than its factorization.

16601615985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 288488.

The product of its (nonzero) digits is 388800, while the sum is 48.

The spelling of 16601615985 in words is "sixteen billion, six hundred one million, six hundred fifteen thousand, nine hundred eighty-five".