665577706 has 8 divisors (see below), whose sum is σ = 998782884. Its totient is φ = 332650080.

The previous prime is 665577701. The next prime is 665577751. The reversal of 665577706 is 607775566.

It can be written as a sum of positive squares in 2 ways, for example, as 477641025 + 187936681 = 21855^2 + 13709^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 665577706.

It is not an unprimeable number, because it can be changed into a prime (665577701) 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, 63285 + ... + 73048.

Almost surely, 2^665577706 is an apocalyptic number.

665577706 is a deficient number, since it is larger than the sum of its proper divisors (333205178).

665577706 is a wasteful number, since it uses less digits than its factorization.

665577706 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 138776.

The product of its (nonzero) digits is 1852200, while the sum is 49.

The square root of 665577706 is about 25798.7927236915. The cubic root of 665577706 is about 873.1045581377.

The spelling of 665577706 in words is "six hundred sixty-five million, five hundred seventy-seven thousand, seven hundred six".