642661166246 has 32 divisors (see below), whose sum is σ = 1071931638816. Its totient is φ = 286483392000.

The previous prime is 642661166239. The next prime is 642661166293.

642661166246 is nontrivially palindromic in base 10.

It is a junction number, because it is equal to n+sod(n) for n = 642661166194 and 642661166203.

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 15 ways as a sum of consecutive naturals, for example, 2611886 + ... + 2847326.

It is an arithmetic number, because the mean of its divisors is an integer number (33497863713).

Almost surely, 2^642661166246 is an apocalyptic number.

642661166246 is a deficient number, since it is larger than the sum of its proper divisors (429270472570).

642661166246 is a wasteful number, since it uses less digits than its factorization.

642661166246 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 237848.

The product of its digits is 2985984, while the sum is 50.

The spelling of 642661166246 in words is "six hundred forty-two billion, six hundred sixty-one million, one hundred sixty-six thousand, two hundred forty-six".