6654639569 has 4 divisors (see below), whose sum is σ = 6670080000. Its totient is φ = 6639199140.

The previous prime is 6654639557. The next prime is 6654639571. The reversal of 6654639569 is 9659364566.

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.

It is a cyclic number.

It is not a de Polignac number, because 6654639569 - 2¹⁶ = 6654574033 is a prime.

It is a super-2 number, since 2×6654639569² = 88568455586601011522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6654639529) 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, 7719569 + ... + 7720430.

It is an arithmetic number, because the mean of its divisors is an integer number (1667520000).

Almost surely, 2^6654639569 is an apocalyptic number.

It is an amenable number.

6654639569 is a deficient number, since it is larger than the sum of its proper divisors (15440431).

6654639569 is a wasteful number, since it uses less digits than its factorization.

6654639569 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15440430.

The product of its digits is 31492800, while the sum is 59.

The square root of 6654639569 is about 81575.9742142256. The cubic root of 6654639569 is about 1880.9395832470.

The spelling of 6654639569 in words is "six billion, six hundred fifty-four million, six hundred thirty-nine thousand, five hundred sixty-nine".