3665556143 has 4 divisors (see below), whose sum is σ = 3666224880. Its totient is φ = 3664887408.

The previous prime is 3665556137. The next prime is 3665556151. The reversal of 3665556143 is 3416555663.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 3416555663 = 31 ⋅110211473.

It is a cyclic number.

It is not a de Polignac number, because 3665556143 - 2⁴ = 3665556127 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 3665556094 and 3665556103.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3665556163) 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, 326078 + ... + 337131.

It is an arithmetic number, because the mean of its divisors is an integer number (916556220).

Almost surely, 2^3665556143 is an apocalyptic number.

3665556143 is a deficient number, since it is larger than the sum of its proper divisors (668737).

3665556143 is an equidigital number, since it uses as much as digits as its factorization.

3665556143 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 668736.

The product of its digits is 972000, while the sum is 44.

The square root of 3665556143 is about 60543.8365401467. The cubic root of 3665556143 is about 1541.8659765938.

The spelling of 3665556143 in words is "three billion, six hundred sixty-five million, five hundred fifty-six thousand, one hundred forty-three".