43073007661 has 6 divisors (see below), whose sum is σ = 45755755850. Its totient is φ = 40539301056.

The previous prime is 43073007631. The next prime is 43073007671. The reversal of 43073007661 is 16670037034.

It can be written as a sum of positive squares in 3 ways, for example, as 32695510761 + 10377496900 = 180819^2 + 101870^2 .

It is not a de Polignac number, because 43073007661 - 2⁹ = 43073007149 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 43073007661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (43073007631) 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 5 ways as a sum of consecutive naturals, for example, 74520486 + ... + 74521063.

Almost surely, 2^43073007661 is an apocalyptic number.

It is an amenable number.

43073007661 is a deficient number, since it is larger than the sum of its proper divisors (2682748189).

43073007661 is a wasteful number, since it uses less digits than its factorization.

43073007661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 149041583 (or 149041566 counting only the distinct ones).

The product of its (nonzero) digits is 63504, while the sum is 37.

The spelling of 43073007661 in words is "forty-three billion, seventy-three million, seven thousand, six hundred sixty-one".