211663711476947 has 2 divisors, whose sum is σ = 211663711476948. Its totient is φ = 211663711476946.

The previous prime is 211663711476923. The next prime is 211663711476961. The reversal of 211663711476947 is 749674117366112.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 211663711476947 - 2²⁴ = 211663694699731 is a prime.

It is a super-2 number, since 2×211663711476947² (a number of 29 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (211663711470947) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 105831855738473 + 105831855738474.

It is an arithmetic number, because the mean of its divisors is an integer number (105831855738474).

Almost surely, 2^{211663711476947} is an apocalyptic number.

211663711476947 is a deficient number, since it is larger than the sum of its proper divisors (1).

211663711476947 is an equidigital number, since it uses as much as digits as its factorization.

211663711476947 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 64012032, while the sum is 65.

The spelling of 211663711476947 in words is "two hundred eleven trillion, six hundred sixty-three billion, seven hundred eleven million, four hundred seventy-six thousand, nine hundred forty-seven".