11951566847971 has 2 divisors, whose sum is σ = 11951566847972. Its totient is φ = 11951566847970.

The previous prime is 11951566847947. The next prime is 11951566848019. The reversal of 11951566847971 is 17974866515911.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 11951566847971 - 2²⁷ = 11951432630243 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 11951566847971.

It is not a weakly prime, because it can be changed into another prime (11951566845971) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5975783423985 + 5975783423986.

It is an arithmetic number, because the mean of its divisors is an integer number (5975783423986).

Almost surely, 2^{11951566847971} is an apocalyptic number.

11951566847971 is a deficient number, since it is larger than the sum of its proper divisors (1).

11951566847971 is an equidigital number, since it uses as much as digits as its factorization.

11951566847971 is an evil number, because the sum of its binary digits is even.

The product of its digits is 114307200, while the sum is 70.

The spelling of 11951566847971 in words is "eleven trillion, nine hundred fifty-one billion, five hundred sixty-six million, eight hundred forty-seven thousand, nine hundred seventy-one".