43136399661 has 4 divisors (see below), whose sum is σ = 57515199552. Its totient is φ = 28757599772.

The previous prime is 43136399659. The next prime is 43136399689. The reversal of 43136399661 is 16699363134.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 43136399661 - 2¹ = 43136399659 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (43136392661) 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, 7189399941 + ... + 7189399946.

It is an arithmetic number, because the mean of its divisors is an integer number (14378799888).

Almost surely, 2^43136399661 is an apocalyptic number.

It is an amenable number.

43136399661 is a deficient number, since it is larger than the sum of its proper divisors (14378799891).

43136399661 is a wasteful number, since it uses less digits than its factorization.

43136399661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14378799890.

The product of its digits is 1889568, while the sum is 51.

The spelling of 43136399661 in words is "forty-three billion, one hundred thirty-six million, three hundred ninety-nine thousand, six hundred sixty-one".