642505231045 has 12 divisors (see below), whose sum is σ = 796679749260. Its totient is φ = 497423400960.

The previous prime is 642505231037. The next prime is 642505231051. The reversal of 642505231045 is 540132505246.

It can be written as a sum of positive squares in 2 ways, for example, as 501013399329 + 141491831716 = 707823^2 + 376154^2 .

It is not a de Polignac number, because 642505231045 - 2³ = 642505231037 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 642505230995 and 642505231013.

It is a congruent number.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 66853180 + ... + 66862789.

It is an arithmetic number, because the mean of its divisors is an integer number (66389979105).

Almost surely, 2^642505231045 is an apocalyptic number.

It is an amenable number.

642505231045 is a deficient number, since it is larger than the sum of its proper divisors (154174518215).

642505231045 is a wasteful number, since it uses less digits than its factorization.

642505231045 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 133716036 (or 133716005 counting only the distinct ones).

The product of its (nonzero) digits is 144000, while the sum is 37.

The spelling of 642505231045 in words is "six hundred forty-two billion, five hundred five million, two hundred thirty-one thousand, forty-five".