640885153 has 2 divisors, whose sum is σ = 640885154. Its totient is φ = 640885152.

The previous prime is 640885139. The next prime is 640885163. The reversal of 640885153 is 351588046.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 638673984 + 2211169 = 25272^2 + 1487^2 .

It is a cyclic number.

It is not a de Polignac number, because 640885153 - 2¹³ = 640876961 is a prime.

It is not a weakly prime, because it can be changed into another prime (640885163) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 320442576 + 320442577.

It is an arithmetic number, because the mean of its divisors is an integer number (320442577).

Almost surely, 2^640885153 is an apocalyptic number.

It is an amenable number.

640885153 is a deficient number, since it is larger than the sum of its proper divisors (1).

640885153 is an equidigital number, since it uses as much as digits as its factorization.

640885153 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 115200, while the sum is 40.

The square root of 640885153 is about 25315.7096088575. The cubic root of 640885153 is about 862.1709855632.

The spelling of 640885153 in words is "six hundred forty million, eight hundred eighty-five thousand, one hundred fifty-three".