42221644065 has 80 divisors (see below), whose sum is σ = 79547529600. Its totient is φ = 21383543808.

The previous prime is 42221644063. The next prime is 42221644183. The reversal of 42221644065 is 56044612224.

42221644065 is a `hidden beast` number, since 4 + 2 + 2 + 2 + 1 + 644 + 0 + 6 + 5 = 666.

It is not a de Polignac number, because 42221644065 - 2¹ = 42221644063 is a prime.

It is not an unprimeable number, because it can be changed into a prime (42221644063) by changing a digit.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 1278481 + ... + 1311089.

It is an arithmetic number, because the mean of its divisors is an integer number (994344120).

Almost surely, 2^42221644065 is an apocalyptic number.

42221644065 is a gapful number since it is divisible by the number (45) formed by its first and last digit.

It is an amenable number.

42221644065 is a deficient number, since it is larger than the sum of its proper divisors (37325885535).

42221644065 is a wasteful number, since it uses less digits than its factorization.

42221644065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32788 (or 32779 counting only the distinct ones).

The product of its (nonzero) digits is 92160, while the sum is 36.

The spelling of 42221644065 in words is "forty-two billion, two hundred twenty-one million, six hundred forty-four thousand, sixty-five".