537721957889 has 2 divisors, whose sum is σ = 537721957890. Its totient is φ = 537721957888.

The previous prime is 537721957859. The next prime is 537721957931. The reversal of 537721957889 is 988759127735.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 531295210000 + 6426747889 = 728900^2 + 80167^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-537721957889 is a prime.

It is not a weakly prime, because it can be changed into another prime (537721957859) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 268860978944 + 268860978945.

It is an arithmetic number, because the mean of its divisors is an integer number (268860978945).

Almost surely, 2^537721957889 is an apocalyptic number.

It is an amenable number.

537721957889 is a deficient number, since it is larger than the sum of its proper divisors (1).

537721957889 is an equidigital number, since it uses as much as digits as its factorization.

537721957889 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 266716800, while the sum is 71.

The spelling of 537721957889 in words is "five hundred thirty-seven billion, seven hundred twenty-one million, nine hundred fifty-seven thousand, eight hundred eighty-nine".