642015066 has 32 divisors (see below), whose sum is σ = 1600869888. Its totient is φ = 166757040.

The previous prime is 642015061. The next prime is 642015097. The reversal of 642015066 is 660510246.

642015066 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (642015061) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 694360 + ... + 695283.

It is an arithmetic number, because the mean of its divisors is an integer number (50027184).

Almost surely, 2^642015066 is an apocalyptic number.

642015066 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

642015066 is an abundant number, since it is smaller than the sum of its proper divisors (958854822).

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

642015066 is a wasteful number, since it uses less digits than its factorization.

642015066 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1389666.

The product of its (nonzero) digits is 8640, while the sum is 30.

The square root of 642015066 is about 25338.0162206910. The cubic root of 642015066 is about 862.6773717968.

The spelling of 642015066 in words is "six hundred forty-two million, fifteen thousand, sixty-six".