64642243633 has 4 divisors (see below), whose sum is σ = 70518811248. Its totient is φ = 58765676020.

The previous prime is 64642243621. The next prime is 64642243637. The reversal of 64642243633 is 33634224646.

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 64642243633 - 2³³ = 56052309041 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 64642243633.

It is not an unprimeable number, because it can be changed into a prime (64642243637) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2938283791 + ... + 2938283812.

It is an arithmetic number, because the mean of its divisors is an integer number (17629702812).

Almost surely, 2^64642243633 is an apocalyptic number.

It is an amenable number.

64642243633 is a deficient number, since it is larger than the sum of its proper divisors (5876567615).

64642243633 is a wasteful number, since it uses less digits than its factorization.

64642243633 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5876567614.

The product of its digits is 1492992, while the sum is 43.

The spelling of 64642243633 in words is "sixty-four billion, six hundred forty-two million, two hundred forty-three thousand, six hundred thirty-three".