645216632520239 has 8 divisors (see below), whose sum is σ = 711796209985392. Its totient is φ = 581058130599360.

The previous prime is 645216632520223. The next prime is 645216632520311. The reversal of 645216632520239 is 932025236612546.

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

It is a cyclic number.

It is not a de Polignac number, because 645216632520239 - 2⁴ = 645216632520223 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (645216632520209) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 605268885509 + ... + 605268886574.

It is an arithmetic number, because the mean of its divisors is an integer number (88974526248174).

Almost surely, 2^{645216632520239} is an apocalyptic number.

645216632520239 is a deficient number, since it is larger than the sum of its proper divisors (66579577465153).

645216632520239 is a wasteful number, since it uses less digits than its factorization.

645216632520239 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1210537772137.

The product of its (nonzero) digits is 27993600, while the sum is 56.

The spelling of 645216632520239 in words is "six hundred forty-five trillion, two hundred sixteen billion, six hundred thirty-two million, five hundred twenty thousand, two hundred thirty-nine".