1998068537 has 2 divisors, whose sum is σ = 1998068538. Its totient is φ = 1998068536.

The previous prime is 1998068491. The next prime is 1998068543. The reversal of 1998068537 is 7358608991.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1530687376 + 467381161 = 39124^2 + 21619^2 .

It is an emirp because it is prime and its reverse (7358608991) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1998068537 - 2¹⁴ = 1998052153 is a prime.

It is not a weakly prime, because it can be changed into another prime (1998068587) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 999034268 + 999034269.

It is an arithmetic number, because the mean of its divisors is an integer number (999034269).

Almost surely, 2^1998068537 is an apocalyptic number.

It is an amenable number.

1998068537 is a deficient number, since it is larger than the sum of its proper divisors (1).

1998068537 is an equidigital number, since it uses as much as digits as its factorization.

1998068537 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3265920, while the sum is 56.

The square root of 1998068537 is about 44699.7599210555. The cubic root of 1998068537 is about 1259.5153374486.

The spelling of 1998068537 in words is "one billion, nine hundred ninety-eight million, sixty-eight thousand, five hundred thirty-seven".