11572743521 has 2 divisors, whose sum is σ = 11572743522. Its totient is φ = 11572743520.

The previous prime is 11572743493. The next prime is 11572743529. The reversal of 11572743521 is 12534727511.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11441297296 + 131446225 = 106964^2 + 11465^2 .

It is a cyclic number.

It is not a de Polignac number, because 11572743521 - 2¹⁸ = 11572481377 is a prime.

It is not a weakly prime, because it can be changed into another prime (11572743529) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5786371760 + 5786371761.

It is an arithmetic number, because the mean of its divisors is an integer number (5786371761).

Almost surely, 2^11572743521 is an apocalyptic number.

It is an amenable number.

11572743521 is a deficient number, since it is larger than the sum of its proper divisors (1).

11572743521 is an equidigital number, since it uses as much as digits as its factorization.

11572743521 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 58800, while the sum is 38.

The spelling of 11572743521 in words is "eleven billion, five hundred seventy-two million, seven hundred forty-three thousand, five hundred twenty-one".