645815606385 has 16 divisors (see below), whose sum is σ = 1041441232896. Its totient is φ = 341722902528.

The previous prime is 645815606383. The next prime is 645815606399. The reversal of 645815606385 is 583606518546.

645815606385 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 645815606385 - 2¹ = 645815606383 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (645815606383) 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, 169503504 + ... + 169507313.

It is an arithmetic number, because the mean of its divisors is an integer number (65090077056).

Almost surely, 2^645815606385 is an apocalyptic number.

It is an amenable number.

645815606385 is a deficient number, since it is larger than the sum of its proper divisors (395625626511).

645815606385 is a wasteful number, since it uses less digits than its factorization.

645815606385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 339010952.

The product of its (nonzero) digits is 20736000, while the sum is 57.

The spelling of 645815606385 in words is "six hundred forty-five billion, eight hundred fifteen million, six hundred six thousand, three hundred eighty-five".