642421236601 has 4 divisors (see below), whose sum is σ = 651469423104. Its totient is φ = 633373050100.

The previous prime is 642421236581. The next prime is 642421236623. The reversal of 642421236601 is 106632124246.

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 642421236601 - 2¹⁹ = 642420712313 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (642421236641) 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, 4524093145 + ... + 4524093286.

It is an arithmetic number, because the mean of its divisors is an integer number (162867355776).

Almost surely, 2^642421236601 is an apocalyptic number.

It is an amenable number.

642421236601 is a deficient number, since it is larger than the sum of its proper divisors (9048186503).

642421236601 is an equidigital number, since it uses as much as digits as its factorization.

642421236601 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9048186502.

The product of its (nonzero) digits is 82944, while the sum is 37.

The spelling of 642421236601 in words is "six hundred forty-two billion, four hundred twenty-one million, two hundred thirty-six thousand, six hundred one".