642646646246 has 16 divisors (see below), whose sum is σ = 1064915043840. Its totient is φ = 288414489480.

The previous prime is 642646646237. The next prime is 642646646267.

642646646246 is nontrivially palindromic in base 10.

It is a junction number, because it is equal to n+sod(n) for n = 642646646191 and 642646646200.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 184879346 + ... + 184882821.

It is an arithmetic number, because the mean of its divisors is an integer number (66557190240).

Almost surely, 2^642646646246 is an apocalyptic number.

642646646246 is a deficient number, since it is larger than the sum of its proper divisors (422268397594).

642646646246 is a wasteful number, since it uses less digits than its factorization.

642646646246 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 369762259.

The product of its digits is 47775744, while the sum is 56.

The spelling of 642646646246 in words is "six hundred forty-two billion, six hundred forty-six million, six hundred forty-six thousand, two hundred forty-six".