642656313326 has 8 divisors (see below), whose sum is σ = 965827654104. Its totient is φ = 320713761960.

The previous prime is 642656313319. The next prime is 642656313331. The reversal of 642656313326 is 623313656246.

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

It is a congruent number.

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, 307196045 + ... + 307198136.

It is an arithmetic number, because the mean of its divisors is an integer number (120728456763).

Almost surely, 2^642656313326 is an apocalyptic number.

642656313326 is a deficient number, since it is larger than the sum of its proper divisors (323171340778).

642656313326 is a wasteful number, since it uses less digits than its factorization.

642656313326 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 614394706.

The product of its digits is 2799360, while the sum is 47.

The spelling of 642656313326 in words is "six hundred forty-two billion, six hundred fifty-six million, three hundred thirteen thousand, three hundred twenty-six".