17989954537 has 2 divisors, whose sum is σ = 17989954538. Its totient is φ = 17989954536.

The previous prime is 17989954517. The next prime is 17989954573. The reversal of 17989954537 is 73545998971.

Together with next prime (17989954573) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17114918976 + 875035561 = 130824^2 + 29581^2 .

It is a cyclic number.

It is not a de Polignac number, because 17989954537 - 2¹⁵ = 17989921769 is a prime.

It is not a weakly prime, because it can be changed into another prime (17989954517) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8994977268 + 8994977269.

It is an arithmetic number, because the mean of its divisors is an integer number (8994977269).

Almost surely, 2^17989954537 is an apocalyptic number.

It is an amenable number.

17989954537 is a deficient number, since it is larger than the sum of its proper divisors (1).

17989954537 is an equidigital number, since it uses as much as digits as its factorization.

17989954537 is an evil number, because the sum of its binary digits is even.

The product of its digits is 85730400, while the sum is 67.

The spelling of 17989954537 in words is "seventeen billion, nine hundred eighty-nine million, nine hundred fifty-four thousand, five hundred thirty-seven".