5665413121 has 4 divisors (see below), whose sum is σ = 5745207744. Its totient is φ = 5585618500.

The previous prime is 5665413119. The next prime is 5665413161. The reversal of 5665413121 is 1213145665.

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, and also an emirpimes, since its reverse is a distinct semiprime: 1213145665 = 5 ⋅242629133.

It is a cyclic number.

It is not a de Polignac number, because 5665413121 - 2¹ = 5665413119 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (5665413161) 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, 39897205 + ... + 39897346.

It is an arithmetic number, because the mean of its divisors is an integer number (1436301936).

Almost surely, 2^5665413121 is an apocalyptic number.

It is an amenable number.

5665413121 is a deficient number, since it is larger than the sum of its proper divisors (79794623).

5665413121 is an equidigital number, since it uses as much as digits as its factorization.

5665413121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79794622.

The product of its digits is 21600, while the sum is 34.

The square root of 5665413121 is about 75268.9386201240. The cubic root of 5665413121 is about 1782.6956086499.

Adding to 5665413121 its reverse (1213145665), we get a palindrome (6878558786).

The spelling of 5665413121 in words is "five billion, six hundred sixty-five million, four hundred thirteen thousand, one hundred twenty-one".