642321066 has 16 divisors (see below), whose sum is σ = 1285056000. Its totient is φ = 214038048.

The previous prime is 642321019. The next prime is 642321077. The reversal of 642321066 is 660123246.

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, 5175 + ... + 36213.

It is an arithmetic number, because the mean of its divisors is an integer number (80316000).

Almost surely, 2^642321066 is an apocalyptic number.

642321066 is an abundant number, since it is smaller than the sum of its proper divisors (642734934).

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

642321066 is a wasteful number, since it uses less digits than its factorization.

642321066 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34493.

The product of its (nonzero) digits is 10368, while the sum is 30.

The square root of 642321066 is about 25344.0538588443. The cubic root of 642321066 is about 862.8144077021.

The spelling of 642321066 in words is "six hundred forty-two million, three hundred twenty-one thousand, sixty-six".