642333886766 has 64 divisors (see below), whose sum is σ = 1162905992640. Its totient is φ = 262143682560.

The previous prime is 642333886763. The next prime is 642333886783. The reversal of 642333886766 is 667688333246.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 642333886699 and 642333886708.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642333886763) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 42203990 + ... + 42219206.

It is an arithmetic number, because the mean of its divisors is an integer number (18170406135).

Almost surely, 2^642333886766 is an apocalyptic number.

642333886766 is a deficient number, since it is larger than the sum of its proper divisors (520572105874).

642333886766 is a wasteful number, since it uses less digits than its factorization.

642333886766 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19269.

The product of its digits is 125411328, while the sum is 62.

The spelling of 642333886766 in words is "six hundred forty-two billion, three hundred thirty-three million, eight hundred eighty-six thousand, seven hundred sixty-six".