665126741 has 4 divisors (see below), whose sum is σ = 665213484. Its totient is φ = 665040000.

The previous prime is 665126729. The next prime is 665126743. The reversal of 665126741 is 147621566.

665126741 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 382046116 + 283080625 = 19546^2 + 16825^2 .

It is a cyclic number.

It is not a de Polignac number, because 665126741 - 2⁶ = 665126677 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 665126695 and 665126704.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (665126743) 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, 30620 + ... + 47621.

It is an arithmetic number, because the mean of its divisors is an integer number (166303371).

Almost surely, 2^665126741 is an apocalyptic number.

It is an amenable number.

665126741 is a deficient number, since it is larger than the sum of its proper divisors (86743).

665126741 is an equidigital number, since it uses as much as digits as its factorization.

665126741 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 86742.

The product of its digits is 60480, while the sum is 38.

The square root of 665126741 is about 25790.0512019655. The cubic root of 665126741 is about 872.9073216850.

The spelling of 665126741 in words is "six hundred sixty-five million, one hundred twenty-six thousand, seven hundred forty-one".