3515685985 has 16 divisors (see below), whose sum is σ = 4822854912. Its totient is φ = 2410084800.

The previous prime is 3515685983. The next prime is 3515685997. The reversal of 3515685985 is 5895865153.

It is not a de Polignac number, because 3515685985 - 2¹ = 3515685983 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3515685983) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 136215 + ... + 159955.

It is an arithmetic number, because the mean of its divisors is an integer number (301428432).

Almost surely, 2^3515685985 is an apocalyptic number.

3515685985 is a gapful number since it is divisible by the number (35) formed by its first and last digit.

It is an amenable number.

3515685985 is a deficient number, since it is larger than the sum of its proper divisors (1307168927).

3515685985 is a wasteful number, since it uses less digits than its factorization.

3515685985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27984.

The product of its digits is 6480000, while the sum is 55.

The square root of 3515685985 is about 59293.2203966018. The cubic root of 3515685985 is about 1520.5592910935.

The spelling of 3515685985 in words is "three billion, five hundred fifteen million, six hundred eighty-five thousand, nine hundred eighty-five".