71820201201523 has 2 divisors, whose sum is σ = 71820201201524. Its totient is φ = 71820201201522.

The previous prime is 71820201201503. The next prime is 71820201201577. The reversal of 71820201201523 is 32510210202817.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 71820201201523 - 2¹⁷ = 71820201070451 is a prime.

It is not a weakly prime, because it can be changed into another prime (71820201201503) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35910100600761 + 35910100600762.

It is an arithmetic number, because the mean of its divisors is an integer number (35910100600762).

Almost surely, 2^{71820201201523} is an apocalyptic number.

71820201201523 is a deficient number, since it is larger than the sum of its proper divisors (1).

71820201201523 is an equidigital number, since it uses as much as digits as its factorization.

71820201201523 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 13440, while the sum is 34.

The spelling of 71820201201523 in words is "seventy-one trillion, eight hundred twenty billion, two hundred one million, two hundred one thousand, five hundred twenty-three".