43621442655 has 64 divisors (see below), whose sum is σ = 84501688320. Its totient is φ = 18758283264.

The previous prime is 43621442653. The next prime is 43621442659. The reversal of 43621442655 is 55624412634.

It is a happy number.

It is not a de Polignac number, because 43621442655 - 2¹ = 43621442653 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (43621442651) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 4094826 + ... + 4105464.

It is an arithmetic number, because the mean of its divisors is an integer number (1320338880).

Almost surely, 2^43621442655 is an apocalyptic number.

43621442655 is a deficient number, since it is larger than the sum of its proper divisors (40880245665).

43621442655 is a wasteful number, since it uses less digits than its factorization.

43621442655 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12968.

The product of its digits is 691200, while the sum is 42.

The spelling of 43621442655 in words is "forty-three billion, six hundred twenty-one million, four hundred forty-two thousand, six hundred fifty-five".