6664599769 has 3 divisors (see below), whose sum is σ = 6664681407. Its totient is φ = 6664518132.

The previous prime is 6664599731. The next prime is 6664599857. The reversal of 6664599769 is 9679954666.

The square root of 6664599769 is 81637.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 4694305225 + 1970294544 = 68515^2 + 44388^2 .

It is a de Polignac number, because none of the positive numbers 2^k-6664599769 is a prime.

It is a super-2 number, since 2×6664599769² = 88833780161909706722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6664599869) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 40819 + ... + 122455.

It is an arithmetic number, because the mean of its divisors is an integer number (2221560469).

Almost surely, 2^6664599769 is an apocalyptic number.

6664599769 is the 81637-th square number.

6664599769 is the 40819-th centered octagonal number.

It is an amenable number.

6664599769 is a deficient number, since it is larger than the sum of its proper divisors (81638).

6664599769 is an frugal number, since it uses more digits than its factorization.

6664599769 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 163274 (or 81637 counting only the distinct ones).

The product of its digits is 132269760, while the sum is 67.

The cubic root of 6664599769 is about 1881.8775351405.

The spelling of 6664599769 in words is "six billion, six hundred sixty-four million, five hundred ninety-nine thousand, seven hundred sixty-nine".