642153644033 has 4 divisors (see below), whose sum is σ = 700531248048. Its totient is φ = 583776040020.

The previous prime is 642153643997. The next prime is 642153644057. The reversal of 642153644033 is 330446351246.

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 642153644033 - 2⁶ = 642153643969 is a prime.

It is a super-2 number, since 2×642153644033² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (642153647033) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 29188801991 + ... + 29188802012.

It is an arithmetic number, because the mean of its divisors is an integer number (175132812012).

Almost surely, 2^642153644033 is an apocalyptic number.

It is an amenable number.

642153644033 is a deficient number, since it is larger than the sum of its proper divisors (58377604015).

642153644033 is a wasteful number, since it uses less digits than its factorization.

642153644033 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58377604014.

The product of its (nonzero) digits is 622080, while the sum is 41.

Adding to 642153644033 its reverse (330446351246), we get a palindrome (972599995279).

The spelling of 642153644033 in words is "six hundred forty-two billion, one hundred fifty-three million, six hundred forty-four thousand, thirty-three".