642426151641 has 8 divisors (see below), whose sum is σ = 856587512640. Its totient is φ = 428274445872.

The previous prime is 642426151621. The next prime is 642426151691. The reversal of 642426151641 is 146151624246.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 642426151641 - 2¹⁰ = 642426150617 is a prime.

It is a super-2 number, since 2×642426151641² (a number of 24 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 642426151593 and 642426151602.

It is not an unprimeable number, because it can be changed into a prime (642426151621) 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 7 ways as a sum of consecutive naturals, for example, 2257101 + ... + 2525738.

It is an arithmetic number, because the mean of its divisors is an integer number (107073439080).

Almost surely, 2^642426151641 is an apocalyptic number.

It is an amenable number.

642426151641 is a deficient number, since it is larger than the sum of its proper divisors (214161360999).

642426151641 is a wasteful number, since it uses less digits than its factorization.

642426151641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4827615.

The product of its digits is 276480, while the sum is 42.

Adding to 642426151641 its reverse (146151624246), we get a palindrome (788577775887).

The spelling of 642426151641 in words is "six hundred forty-two billion, four hundred twenty-six million, one hundred fifty-one thousand, six hundred forty-one".