665967745 has 8 divisors (see below), whose sum is σ = 826718760. Its totient is φ = 514402560.

The previous prime is 665967721. The next prime is 665967749. The reversal of 665967745 is 547769566.

665967745 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 124567921 + 541399824 = 11161^2 + 23268^2 .

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

It is not a de Polignac number, because 665967745 - 2¹⁷ = 665836673 is a prime.

It is not an unprimeable number, because it can be changed into a prime (665967749) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2296296 + ... + 2296585.

It is an arithmetic number, because the mean of its divisors is an integer number (103339845).

Almost surely, 2^665967745 is an apocalyptic number.

It is an amenable number.

665967745 is a deficient number, since it is larger than the sum of its proper divisors (160751015).

665967745 is a wasteful number, since it uses less digits than its factorization.

665967745 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4592915.

The product of its digits is 9525600, while the sum is 55.

The square root of 665967745 is about 25806.3508656300. The cubic root of 665967745 is about 873.2750758328.

The spelling of 665967745 in words is "six hundred sixty-five million, nine hundred sixty-seven thousand, seven hundred forty-five".