1617872985 has 24 divisors (see below), whose sum is σ = 2818420800. Its totient is φ = 858524832.

The previous prime is 1617872951. The next prime is 1617872999. The reversal of 1617872985 is 5892787161.

It is not a de Polignac number, because 1617872985 - 2¹⁹ = 1617348697 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 81379 + ... + 99288.

It is an arithmetic number, because the mean of its divisors is an integer number (117434200).

Almost surely, 2^1617872985 is an apocalyptic number.

1617872985 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1617872985 is a deficient number, since it is larger than the sum of its proper divisors (1200547815).

1617872985 is a wasteful number, since it uses less digits than its factorization.

1617872985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 180877 (or 180874 counting only the distinct ones).

The product of its digits is 1693440, while the sum is 54.

The square root of 1617872985 is about 40222.7918598399. The cubic root of 1617872985 is about 1173.9460559789.

The spelling of 1617872985 in words is "one billion, six hundred seventeen million, eight hundred seventy-two thousand, nine hundred eighty-five".