645216632520241 has 16 divisors (see below), whose sum is σ = 672748420924800. Its totient is φ = 618256707344640.

The previous prime is 645216632520223. The next prime is 645216632520311. The reversal of 645216632520241 is 142025236612546.

It is a cyclic number.

It is not a de Polignac number, because 645216632520241 - 2⁵ = 645216632520209 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (645216632520211) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7319436 + ... + 36660706.

It is an arithmetic number, because the mean of its divisors is an integer number (42046776307800).

Almost surely, 2^{645216632520241} is an apocalyptic number.

It is an amenable number.

645216632520241 is a deficient number, since it is larger than the sum of its proper divisors (27531788404559).

645216632520241 is a wasteful number, since it uses less digits than its factorization.

645216632520241 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29351016.

The product of its (nonzero) digits is 4147200, while the sum is 49.

The spelling of 645216632520241 in words is "six hundred forty-five trillion, two hundred sixteen billion, six hundred thirty-two million, five hundred twenty thousand, two hundred forty-one".