640209617147 has 2 divisors, whose sum is σ = 640209617148. Its totient is φ = 640209617146.

The previous prime is 640209617141. The next prime is 640209617189. The reversal of 640209617147 is 741716902046.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-640209617147 is a prime.

It is not a weakly prime, because it can be changed into another prime (640209617141) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 320104808573 + 320104808574.

It is an arithmetic number, because the mean of its divisors is an integer number (320104808574).

Almost surely, 2^640209617147 is an apocalyptic number.

640209617147 is a deficient number, since it is larger than the sum of its proper divisors (1).

640209617147 is an equidigital number, since it uses as much as digits as its factorization.

640209617147 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 508032, while the sum is 47.

The spelling of 640209617147 in words is "six hundred forty billion, two hundred nine million, six hundred seventeen thousand, one hundred forty-seven".