3661848509 has 4 divisors (see below), whose sum is σ = 3994743840. Its totient is φ = 3328953180.

The previous prime is 3661848497. The next prime is 3661848517. The reversal of 3661848509 is 9058481663.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3661848509 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3661848559) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 166447649 + ... + 166447670.

It is an arithmetic number, because the mean of its divisors is an integer number (998685960).

Almost surely, 2^3661848509 is an apocalyptic number.

It is an amenable number.

3661848509 is a deficient number, since it is larger than the sum of its proper divisors (332895331).

3661848509 is a wasteful number, since it uses less digits than its factorization.

3661848509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 332895330.

The product of its (nonzero) digits is 1244160, while the sum is 50.

The square root of 3661848509 is about 60513.2093761354. The cubic root of 3661848509 is about 1541.3459460708.

The spelling of 3661848509 in words is "three billion, six hundred sixty-one million, eight hundred forty-eight thousand, five hundred nine".