646240422642 has 16 divisors (see below), whose sum is σ = 1293343092000. Its totient is φ = 215269766432.

The previous prime is 646240422623. The next prime is 646240422643. The reversal of 646240422642 is 246224042646.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 646240422594 and 646240422603.

It is not an unprimeable number, because it can be changed into a prime (646240422643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 35917203 + ... + 35935190.

It is an arithmetic number, because the mean of its divisors is an integer number (80833943250).

Almost surely, 2^646240422642 is an apocalyptic number.

646240422642 is an abundant number, since it is smaller than the sum of its proper divisors (647102669358).

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

646240422642 is a wasteful number, since it uses less digits than its factorization.

646240422642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71853897.

The product of its (nonzero) digits is 884736, while the sum is 42.

The spelling of 646240422642 in words is "six hundred forty-six billion, two hundred forty million, four hundred twenty-two thousand, six hundred forty-two".