1938871516537 has 2 divisors, whose sum is σ = 1938871516538. Its totient is φ = 1938871516536.

The previous prime is 1938871516513. The next prime is 1938871516619. The reversal of 1938871516537 is 7356151788391.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1395755579241 + 543115937296 = 1181421^2 + 736964^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1938871516537 is a prime.

It is not a weakly prime, because it can be changed into another prime (1938871517537) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 969435758268 + 969435758269.

It is an arithmetic number, because the mean of its divisors is an integer number (969435758269).

Almost surely, 2^{1938871516537} is an apocalyptic number.

It is an amenable number.

1938871516537 is a deficient number, since it is larger than the sum of its proper divisors (1).

1938871516537 is an equidigital number, since it uses as much as digits as its factorization.

1938871516537 is an evil number, because the sum of its binary digits is even.

The product of its digits is 38102400, while the sum is 64.

The spelling of 1938871516537 in words is "one trillion, nine hundred thirty-eight billion, eight hundred seventy-one million, five hundred sixteen thousand, five hundred thirty-seven".