642286439631 has 16 divisors (see below), whose sum is σ = 977252642400. Its totient is φ = 416618230464.

The previous prime is 642286439623. The next prime is 642286439681. The reversal of 642286439631 is 136934682246.

It is not a de Polignac number, because 642286439631 - 2³ = 642286439623 is a prime.

It is a super-2 number, since 2×642286439631² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642286439611) 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 15 ways as a sum of consecutive naturals, for example, 321463686 + ... + 321465683.

It is an arithmetic number, because the mean of its divisors is an integer number (61078290150).

Almost surely, 2^642286439631 is an apocalyptic number.

642286439631 is a deficient number, since it is larger than the sum of its proper divisors (334966202769).

642286439631 is a wasteful number, since it uses less digits than its factorization.

642286439631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 642929415 (or 642929409 counting only the distinct ones).

The product of its digits is 8957952, while the sum is 54.

The spelling of 642286439631 in words is "six hundred forty-two billion, two hundred eighty-six million, four hundred thirty-nine thousand, six hundred thirty-one".