5665478999 has 4 divisors (see below), whose sum is σ = 5665696440. Its totient is φ = 5665261560.

The previous prime is 5665478969. The next prime is 5665479019. The reversal of 5665478999 is 9998745665.

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 5665478999 - 2⁸ = 5665478743 is a prime.

It is a super-2 number, since 2×5665478999² = 64195304576220084002, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5665478969) 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, 63317 + ... + 123854.

It is an arithmetic number, because the mean of its divisors is an integer number (1416424110).

Almost surely, 2^5665478999 is an apocalyptic number.

5665478999 is a deficient number, since it is larger than the sum of its proper divisors (217441).

5665478999 is a wasteful number, since it uses less digits than its factorization.

5665478999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 217440.

The product of its digits is 146966400, while the sum is 68.

The square root of 5665478999 is about 75269.3762362888. The cubic root of 5665478999 is about 1782.7025184117.

The spelling of 5665478999 in words is "five billion, six hundred sixty-five million, four hundred seventy-eight thousand, nine hundred ninety-nine".