210340259653 has 2 divisors, whose sum is σ = 210340259654. Its totient is φ = 210340259652.

The previous prime is 210340259611. The next prime is 210340259681. The reversal of 210340259653 is 356952043012.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 205751145604 + 4589114049 = 453598^2 + 67743^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-210340259653 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (210340259453) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105170129826 + 105170129827.

It is an arithmetic number, because the mean of its divisors is an integer number (105170129827).

Almost surely, 2^210340259653 is an apocalyptic number.

It is an amenable number.

210340259653 is a deficient number, since it is larger than the sum of its proper divisors (1).

210340259653 is an equidigital number, since it uses as much as digits as its factorization.

210340259653 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 194400, while the sum is 40.

The spelling of 210340259653 in words is "two hundred ten billion, three hundred forty million, two hundred fifty-nine thousand, six hundred fifty-three".