3661991383 has 4 divisors (see below), whose sum is σ = 3751308288. Its totient is φ = 3572674480.

The previous prime is 3661991363. The next prime is 3661991393. The reversal of 3661991383 is 3831991663.

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

It is a cyclic number.

It is not a de Polignac number, because 3661991383 - 2⁵ = 3661991351 is a prime.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3661991363) 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, 44658391 + ... + 44658472.

It is an arithmetic number, because the mean of its divisors is an integer number (937827072).

Almost surely, 2^3661991383 is an apocalyptic number.

3661991383 is a deficient number, since it is larger than the sum of its proper divisors (89316905).

3661991383 is an equidigital number, since it uses as much as digits as its factorization.

3661991383 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 89316904.

The product of its digits is 629856, while the sum is 49.

The square root of 3661991383 is about 60514.3898837293. The cubic root of 3661991383 is about 1541.3659919935.

The spelling of 3661991383 in words is "three billion, six hundred sixty-one million, nine hundred ninety-one thousand, three hundred eighty-three".