640385752177 has 2 divisors, whose sum is σ = 640385752178. Its totient is φ = 640385752176.

The previous prime is 640385752133. The next prime is 640385752183. The reversal of 640385752177 is 771257583046.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 507604951296 + 132780800881 = 712464^2 + 364391^2 .

It is a cyclic number.

It is not a de Polignac number, because 640385752177 - 2¹⁵ = 640385719409 is a prime.

It is not a weakly prime, because it can be changed into another prime (640385752777) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 320192876088 + 320192876089.

It is an arithmetic number, because the mean of its divisors is an integer number (320192876089).

Almost surely, 2^640385752177 is an apocalyptic number.

It is an amenable number.

640385752177 is a deficient number, since it is larger than the sum of its proper divisors (1).

640385752177 is an equidigital number, since it uses as much as digits as its factorization.

640385752177 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9878400, while the sum is 55.

The spelling of 640385752177 in words is "six hundred forty billion, three hundred eighty-five million, seven hundred fifty-two thousand, one hundred seventy-seven".