538660089581 has 2 divisors, whose sum is σ = 538660089582. Its totient is φ = 538660089580.

The previous prime is 538660089571. The next prime is 538660089607. The reversal of 538660089581 is 185980066835.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 377353432681 + 161306656900 = 614291^2 + 401630^2 .

It is a cyclic number.

It is not a de Polignac number, because 538660089581 - 2²² = 538655895277 is a prime.

It is a super-2 number, since 2×538660089581² (a number of 24 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 538660089581.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (538660089571) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 269330044790 + 269330044791.

It is an arithmetic number, because the mean of its divisors is an integer number (269330044791).

Almost surely, 2^538660089581 is an apocalyptic number.

It is an amenable number.

538660089581 is a deficient number, since it is larger than the sum of its proper divisors (1).

538660089581 is an equidigital number, since it uses as much as digits as its factorization.

538660089581 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12441600, while the sum is 59.

The spelling of 538660089581 in words is "five hundred thirty-eight billion, six hundred sixty million, eighty-nine thousand, five hundred eighty-one".