5665651 has 4 divisors (see below), whose sum is σ = 5729400. Its totient is φ = 5601904.

The previous prime is 5665631. The next prime is 5665661. The reversal of 5665651 is 1565665.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1565665 = 5 ⋅313133.

It is a cyclic number.

It is not a de Polignac number, because 5665651 - 2¹⁵ = 5632883 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (5665601) 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, 31741 + ... + 31918.

It is an arithmetic number, because the mean of its divisors is an integer number (1432350).

Almost surely, 2^5665651 is an apocalyptic number.

5665651 is a deficient number, since it is larger than the sum of its proper divisors (63749).

5665651 is an equidigital number, since it uses as much as digits as its factorization.

5665651 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63748.

The product of its digits is 27000, while the sum is 34.

The square root of 5665651 is about 2380.2628006168. The cubic root of 5665651 is about 178.2720558870.

The spelling of 5665651 in words is "five million, six hundred sixty-five thousand, six hundred fifty-one".