3640363861 has 2 divisors, whose sum is σ = 3640363862. Its totient is φ = 3640363860.

The previous prime is 3640363813. The next prime is 3640363879. The reversal of 3640363861 is 1683630463.

3640363861 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2579624100 + 1060739761 = 50790^2 + 32569^2 .

It is a cyclic number.

It is not a de Polignac number, because 3640363861 - 2¹³ = 3640355669 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3640363261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1820181930 + 1820181931.

It is an arithmetic number, because the mean of its divisors is an integer number (1820181931).

Almost surely, 2^3640363861 is an apocalyptic number.

It is an amenable number.

3640363861 is a deficient number, since it is larger than the sum of its proper divisors (1).

3640363861 is an equidigital number, since it uses as much as digits as its factorization.

3640363861 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 186624, while the sum is 40.

The square root of 3640363861 is about 60335.4279093138. The cubic root of 3640363861 is about 1538.3255907191.

The spelling of 3640363861 in words is "three billion, six hundred forty million, three hundred sixty-three thousand, eight hundred sixty-one".