3661655249 has 4 divisors (see below), whose sum is σ = 4184748864. Its totient is φ = 3138561636.

The previous prime is 3661655219. The next prime is 3661655287. The reversal of 3661655249 is 9425561663.

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 not a de Polignac number, because 3661655249 - 2²⁰ = 3660606673 is a prime.

It is a super-3 number, since 3×3661655249³ (a number of 30 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3661655219) 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, 261546797 + ... + 261546810.

It is an arithmetic number, because the mean of its divisors is an integer number (1046187216).

Almost surely, 2^3661655249 is an apocalyptic number.

It is an amenable number.

3661655249 is a deficient number, since it is larger than the sum of its proper divisors (523093615).

3661655249 is an equidigital number, since it uses as much as digits as its factorization.

3661655249 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 523093614.

The product of its digits is 1166400, while the sum is 47.

The square root of 3661655249 is about 60511.6125136325. The cubic root of 3661655249 is about 1541.3188299155.

The spelling of 3661655249 in words is "three billion, six hundred sixty-one million, six hundred fifty-five thousand, two hundred forty-nine".