642662445126 has 32 divisors (see below), whose sum is σ = 1384327784448. Its totient is φ = 197723469600.

The previous prime is 642662445091. The next prime is 642662445221. The reversal of 642662445126 is 621544266246.

It is a happy number.

It is a super-2 number, since 2×642662445126² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 443995 + ... + 1217561.

It is an arithmetic number, because the mean of its divisors is an integer number (43260243264).

Almost surely, 2^642662445126 is an apocalyptic number.

642662445126 is an abundant number, since it is smaller than the sum of its proper divisors (741665339322).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

642662445126 is a wasteful number, since it uses less digits than its factorization.

642662445126 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 784236.

The product of its digits is 3317760, while the sum is 48.

The spelling of 642662445126 in words is "six hundred forty-two billion, six hundred sixty-two million, four hundred forty-five thousand, one hundred twenty-six".