3685486581 has 64 divisors (see below), whose sum is σ = 6531379200. Its totient is φ = 2008214208.

The previous prime is 3685486577. The next prime is 3685486583. The reversal of 3685486581 is 1856845863.

3685486581 is a `hidden beast` number, since 3 + 6 + 8 + 54 + 8 + 6 + 581 = 666.

It is not a de Polignac number, because 3685486581 - 2² = 3685486577 is a prime.

It is a super-2 number, since 2×3685486581² = 27165622677462139122, which contains 22 as substring.

It is a Smith number, since the sum of its digits (54) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3685486583) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1646395 + ... + 1648631.

It is an arithmetic number, because the mean of its divisors is an integer number (102052800).

Almost surely, 2^3685486581 is an apocalyptic number.

It is an amenable number.

3685486581 is a deficient number, since it is larger than the sum of its proper divisors (2845892619).

3685486581 is a wasteful number, since it uses less digits than its factorization.

3685486581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2655 (or 2649 counting only the distinct ones).

The product of its digits is 5529600, while the sum is 54.

The square root of 3685486581 is about 60708.2085141705. The cubic root of 3685486581 is about 1544.6554156588.

The spelling of 3685486581 in words is "three billion, six hundred eighty-five million, four hundred eighty-six thousand, five hundred eighty-one".