3640348861 has 2 divisors, whose sum is σ = 3640348862. Its totient is φ = 3640348860.

The previous prime is 3640348853. The next prime is 3640348919. The reversal of 3640348861 is 1688430463.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1951960761 + 1688388100 = 44181^2 + 41090^2 .

It is a cyclic number.

It is not a de Polignac number, because 3640348861 - 2³ = 3640348853 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3640348661) 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, 1820174430 + 1820174431.

It is an arithmetic number, because the mean of its divisors is an integer number (1820174431).

Almost surely, 2^3640348861 is an apocalyptic number.

It is an amenable number.

3640348861 is a deficient number, since it is larger than the sum of its proper divisors (1).

3640348861 is an equidigital number, since it uses as much as digits as its factorization.

3640348861 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 331776, while the sum is 43.

The square root of 3640348861 is about 60335.3036041089. The cubic root of 3640348861 is about 1538.3234778428.

It can be divided in two parts, 36403 and 48861, that added together give a square (85264 = 292²).

The spelling of 3640348861 in words is "three billion, six hundred forty million, three hundred forty-eight thousand, eight hundred sixty-one".