642276016321 has 4 divisors (see below), whose sum is σ = 676080017200. Its totient is φ = 608472015444.

The previous prime is 642276016303. The next prime is 642276016339. The reversal of 642276016321 is 123610672246.

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 an interprime number because it is at equal distance from previous prime (642276016303) and next prime (642276016339).

It is a cyclic number.

It is not a de Polignac number, because 642276016321 - 2²⁷ = 642141798593 is a prime.

It is a super-2 number, since 2×642276016321² (a number of 24 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (642276016121) 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, 16902000411 + ... + 16902000448.

It is an arithmetic number, because the mean of its divisors is an integer number (169020004300).

Almost surely, 2^642276016321 is an apocalyptic number.

It is an amenable number.

642276016321 is a deficient number, since it is larger than the sum of its proper divisors (33804000879).

642276016321 is a wasteful number, since it uses less digits than its factorization.

642276016321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33804000878.

The product of its (nonzero) digits is 145152, while the sum is 40.

Adding to 642276016321 its reverse (123610672246), we get a palindrome (765886688567).

The spelling of 642276016321 in words is "six hundred forty-two billion, two hundred seventy-six million, sixteen thousand, three hundred twenty-one".