640020566277 has 12 divisors (see below), whose sum is σ = 928310146764. Its totient is φ = 424909918080.

The previous prime is 640020566257. The next prime is 640020566281. The reversal of 640020566277 is 772665020046.

640020566277 is a `hidden beast` number, since 6 + 40 + 0 + 20 + 566 + 27 + 7 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 184873340961 + 455147225316 = 429969^2 + 674646^2 .

It is a de Polignac number, because none of the positive numbers 2^k-640020566277 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (640020566257) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 147535998 + ... + 147540335.

It is an arithmetic number, because the mean of its divisors is an integer number (77359178897).

Almost surely, 2^640020566277 is an apocalyptic number.

It is an amenable number.

640020566277 is a deficient number, since it is larger than the sum of its proper divisors (288289580487).

640020566277 is a wasteful number, since it uses less digits than its factorization.

640020566277 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 295076580 (or 295076577 counting only the distinct ones).

The product of its (nonzero) digits is 846720, while the sum is 45.

The spelling of 640020566277 in words is "six hundred forty billion, twenty million, five hundred sixty-six thousand, two hundred seventy-seven".