3665913785 has 4 divisors (see below), whose sum is σ = 4399096548. Its totient is φ = 2932731024.

The previous prime is 3665913763. The next prime is 3665913791. The reversal of 3665913785 is 5873195663.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 451817536 + 3214096249 = 21256^2 + 56693^2 .

It is a cyclic number.

It is not a de Polignac number, because 3665913785 - 2²⁶ = 3598804921 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 366591374 + ... + 366591383.

It is an arithmetic number, because the mean of its divisors is an integer number (1099774137).

Almost surely, 2^3665913785 is an apocalyptic number.

It is an amenable number.

3665913785 is a deficient number, since it is larger than the sum of its proper divisors (733182763).

3665913785 is an equidigital number, since it uses as much as digits as its factorization.

3665913785 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 733182762.

The product of its digits is 4082400, while the sum is 53.

The square root of 3665913785 is about 60546.7900470372. The cubic root of 3665913785 is about 1541.9161206990.

The spelling of 3665913785 in words is "three billion, six hundred sixty-five million, nine hundred thirteen thousand, seven hundred eighty-five".