645206878040006 has 8 divisors (see below), whose sum is σ = 968259834166824. Its totient is φ = 322453599984400.

The previous prime is 645206878039847. The next prime is 645206878040009. The reversal of 645206878040006 is 600040878602546.

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

It is a super-3 number, since 3×645206878040006³ (a number of 45 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645206878040009) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 74919512420 + ... + 74919521031.

It is an arithmetic number, because the mean of its divisors is an integer number (121032479270853).

Almost surely, 2^{645206878040006} is an apocalyptic number.

645206878040006 is a deficient number, since it is larger than the sum of its proper divisors (323052956126818).

645206878040006 is a wasteful number, since it uses less digits than its factorization.

645206878040006 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 149839035606.

The product of its (nonzero) digits is 15482880, while the sum is 56.

The spelling of 645206878040006 in words is "six hundred forty-five trillion, two hundred six billion, eight hundred seventy-eight million, forty thousand, six".