642951066 has 8 divisors (see below), whose sum is σ = 1285902144. Its totient is φ = 214317020.

The previous prime is 642951061. The next prime is 642951097. The reversal of 642951066 is 660159246.

642951066 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

642951066 is an admirable number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (642951061) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 53579250 + ... + 53579261.

It is an arithmetic number, because the mean of its divisors is an integer number (160737768).

Almost surely, 2^642951066 is an apocalyptic number.

642951066 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

642951066 is a wasteful number, since it uses less digits than its factorization.

642951066 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 107158516.

The product of its (nonzero) digits is 77760, while the sum is 39.

The square root of 642951066 is about 25356.4797635634. The cubic root of 642951066 is about 863.0964034655.

The spelling of 642951066 in words is "six hundred forty-two million, nine hundred fifty-one thousand, sixty-six".