71821628573 has 2 divisors, whose sum is σ = 71821628574. Its totient is φ = 71821628572.

The previous prime is 71821628521. The next prime is 71821628629. The reversal of 71821628573 is 37582612817.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 36527618884 + 35294009689 = 191122^2 + 187867^2 .

It is a cyclic number.

It is not a de Polignac number, because 71821628573 - 2³² = 67526661277 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (71821628503) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35910814286 + 35910814287.

It is an arithmetic number, because the mean of its divisors is an integer number (35910814287).

Almost surely, 2^71821628573 is an apocalyptic number.

It is an amenable number.

71821628573 is a deficient number, since it is larger than the sum of its proper divisors (1).

71821628573 is an equidigital number, since it uses as much as digits as its factorization.

71821628573 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1128960, while the sum is 50.

The spelling of 71821628573 in words is "seventy-one billion, eight hundred twenty-one million, six hundred twenty-eight thousand, five hundred seventy-three".