4640140261 has 2 divisors, whose sum is σ = 4640140262. Its totient is φ = 4640140260.

The previous prime is 4640140243. The next prime is 4640140291. The reversal of 4640140261 is 1620410464.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2581249636 + 2058890625 = 50806^2 + 45375^2 .

It is a cyclic number.

It is not a de Polignac number, because 4640140261 - 2⁷ = 4640140133 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4640140231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2320070130 + 2320070131.

It is an arithmetic number, because the mean of its divisors is an integer number (2320070131).

Almost surely, 2^4640140261 is an apocalyptic number.

It is an amenable number.

4640140261 is a deficient number, since it is larger than the sum of its proper divisors (1).

4640140261 is an equidigital number, since it uses as much as digits as its factorization.

4640140261 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4608, while the sum is 28.

The square root of 4640140261 is about 68118.5750071153. The cubic root of 4640140261 is about 1667.9269891432.

The spelling of 4640140261 in words is "four billion, six hundred forty million, one hundred forty thousand, two hundred sixty-one".