353660311621 has 2 divisors, whose sum is σ = 353660311622. Its totient is φ = 353660311620.

The previous prime is 353660311603. The next prime is 353660311633. The reversal of 353660311621 is 126113066353.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 197212375396 + 156447936225 = 444086^2 + 395535^2 .

It is a cyclic number.

It is not a de Polignac number, because 353660311621 - 2²⁵ = 353626757189 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (353660311661) 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, 176830155810 + 176830155811.

It is an arithmetic number, because the mean of its divisors is an integer number (176830155811).

Almost surely, 2^353660311621 is an apocalyptic number.

It is an amenable number.

353660311621 is a deficient number, since it is larger than the sum of its proper divisors (1).

353660311621 is an equidigital number, since it uses as much as digits as its factorization.

353660311621 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 58320, while the sum is 37.

Adding to 353660311621 its reverse (126113066353), we get a palindrome (479773377974).

It can be divided in two parts, 353660 and 311621, that added together give a triangular number (665281 = T₁₁₅₃).

The spelling of 353660311621 in words is "three hundred fifty-three billion, six hundred sixty million, three hundred eleven thousand, six hundred twenty-one".