642964066 has 8 divisors (see below), whose sum is σ = 1015206480. Its totient is φ = 304561908.

The previous prime is 642964037. The next prime is 642964073. The reversal of 642964066 is 660469246.

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8460016 + ... + 8460091.

It is an arithmetic number, because the mean of its divisors is an integer number (126900810).

Almost surely, 2^642964066 is an apocalyptic number.

642964066 is a deficient number, since it is larger than the sum of its proper divisors (372242414).

642964066 is a wasteful number, since it uses less digits than its factorization.

642964066 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16920128.

The product of its (nonzero) digits is 373248, while the sum is 43.

The square root of 642964066 is about 25356.7361069993. The cubic root of 642964066 is about 863.1022204855.

The spelling of 642964066 in words is "six hundred forty-two million, nine hundred sixty-four thousand, sixty-six".