640322356545 has 16 divisors (see below), whose sum is σ = 1138350856320. Its totient is φ = 341505256752.

The previous prime is 640322356543. The next prime is 640322356547. The reversal of 640322356545 is 545653223046.

640322356545 is a `hidden beast` number, since 6 + 4 + 0 + 32 + 23 + 56 + 545 = 666.

It is an interprime number because it is at equal distance from previous prime (640322356543) and next prime (640322356547).

It is not a de Polignac number, because 640322356545 - 2¹ = 640322356543 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 640322356545.

It is not an unprimeable number, because it can be changed into a prime (640322356543) 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, 2371564149 + ... + 2371564418.

It is an arithmetic number, because the mean of its divisors is an integer number (71146928520).

Almost surely, 2^640322356545 is an apocalyptic number.

It is an amenable number.

640322356545 is a deficient number, since it is larger than the sum of its proper divisors (498028499775).

640322356545 is a wasteful number, since it uses less digits than its factorization.

640322356545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4743128581 (or 4743128575 counting only the distinct ones).

The product of its (nonzero) digits is 2592000, while the sum is 45.

The spelling of 640322356545 in words is "six hundred forty billion, three hundred twenty-two million, three hundred fifty-six thousand, five hundred forty-five".