3661291765 has 8 divisors (see below), whose sum is σ = 4394092248. Its totient is φ = 2928672000.

The previous prime is 3661291741. The next prime is 3661291769. The reversal of 3661291765 is 5671921663.

It can be written as a sum of positive squares in 4 ways, for example, as 317445489 + 3343846276 = 17817^2 + 57826^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 3661291765 - 2¹³ = 3661283573 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 (3661291769) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4329 + ... + 85681.

It is an arithmetic number, because the mean of its divisors is an integer number (549261531).

Almost surely, 2^3661291765 is an apocalyptic number.

It is an amenable number.

3661291765 is a deficient number, since it is larger than the sum of its proper divisors (732800483).

3661291765 is an equidigital number, since it uses as much as digits as its factorization.

3661291765 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90359.

The product of its digits is 408240, while the sum is 46.

The square root of 3661291765 is about 60508.6090155773. The cubic root of 3661291765 is about 1541.2678271828.

The spelling of 3661291765 in words is "three billion, six hundred sixty-one million, two hundred ninety-one thousand, seven hundred sixty-five".