215205662421683 has 2 divisors, whose sum is σ = 215205662421684. Its totient is φ = 215205662421682.

The previous prime is 215205662421613. The next prime is 215205662421689. The reversal of 215205662421683 is 386124266502512.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 215205662421683 - 2¹⁸ = 215205662159539 is a prime.

It is a super-2 number, since 2×215205662421683² (a number of 29 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (215205662421689) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 107602831210841 + 107602831210842.

It is an arithmetic number, because the mean of its divisors is an integer number (107602831210842).

Almost surely, 2^{215205662421683} is an apocalyptic number.

215205662421683 is a deficient number, since it is larger than the sum of its proper divisors (1).

215205662421683 is an equidigital number, since it uses as much as digits as its factorization.

215205662421683 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8294400, while the sum is 53.

The spelling of 215205662421683 in words is "two hundred fifteen trillion, two hundred five billion, six hundred sixty-two million, four hundred twenty-one thousand, six hundred eighty-three".