81952553171 has 2 divisors, whose sum is σ = 81952553172. Its totient is φ = 81952553170.

The previous prime is 81952553167. The next prime is 81952553173. The reversal of 81952553171 is 17135525918.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 81952553171 - 2² = 81952553167 is a prime.

Together with 81952553173, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (81952553173) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40976276585 + 40976276586.

It is an arithmetic number, because the mean of its divisors is an integer number (40976276586).

Almost surely, 2^81952553171 is an apocalyptic number.

81952553171 is a deficient number, since it is larger than the sum of its proper divisors (1).

81952553171 is an equidigital number, since it uses as much as digits as its factorization.

81952553171 is an evil number, because the sum of its binary digits is even.

The product of its digits is 378000, while the sum is 47.

The spelling of 81952553171 in words is "eighty-one billion, nine hundred fifty-two million, five hundred fifty-three thousand, one hundred seventy-one".