736003661 has 4 divisors (see below), whose sum is σ = 779298012. Its totient is φ = 692709312.

The previous prime is 736003651. The next prime is 736003663. The reversal of 736003661 is 166300637.

It is a happy number.

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 353214436 + 382789225 = 18794^2 + 19565^2 .

It is a cyclic number.

It is not a de Polignac number, because 736003661 - 2¹⁴ = 735987277 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (736003663) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21647150 + ... + 21647183.

It is an arithmetic number, because the mean of its divisors is an integer number (194824503).

Almost surely, 2^736003661 is an apocalyptic number.

It is an amenable number.

736003661 is a deficient number, since it is larger than the sum of its proper divisors (43294351).

736003661 is a wasteful number, since it uses less digits than its factorization.

736003661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43294350.

The product of its (nonzero) digits is 13608, while the sum is 32.

The square root of 736003661 is about 27129.3874055424. The cubic root of 736003661 is about 902.8729841089.

The spelling of 736003661 in words is "seven hundred thirty-six million, three thousand, six hundred sixty-one".