642832665 has 8 divisors (see below), whose sum is σ = 1028532288. Its totient is φ = 342844080.

The previous prime is 642832657. The next prime is 642832667. The reversal of 642832665 is 566238246.

It is a happy number.

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

It is not a de Polignac number, because 642832665 - 2³ = 642832657 is a prime.

It is not an unprimeable number, because it can be changed into a prime (642832667) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21427741 + ... + 21427770.

It is an arithmetic number, because the mean of its divisors is an integer number (128566536).

Almost surely, 2^642832665 is an apocalyptic number.

It is an amenable number.

642832665 is a deficient number, since it is larger than the sum of its proper divisors (385699623).

642832665 is a wasteful number, since it uses less digits than its factorization.

642832665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42855519.

The product of its digits is 414720, while the sum is 42.

The square root of 642832665 is about 25354.1449274078. The cubic root of 642832665 is about 863.0434197802.

It can be divided in two parts, 6428 and 32665, that added together give a palindrome (39093).

The spelling of 642832665 in words is "six hundred forty-two million, eight hundred thirty-two thousand, six hundred sixty-five".