1837138978897 has 2 divisors, whose sum is σ = 1837138978898. Its totient is φ = 1837138978896.

The previous prime is 1837138978861. The next prime is 1837138978981. The reversal of 1837138978897 is 7988798317381.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1686234699601 + 150904279296 = 1298551^2 + 388464^2 .

It is a cyclic number.

It is not a de Polignac number, because 1837138978897 - 2²³ = 1837130590289 is a prime.

It is a super-2 number, since 2×1837138978897² (a number of 25 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1837138972897) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 918569489448 + 918569489449.

It is an arithmetic number, because the mean of its divisors is an integer number (918569489449).

Almost surely, 2^{1837138978897} is an apocalyptic number.

It is an amenable number.

1837138978897 is a deficient number, since it is larger than the sum of its proper divisors (1).

1837138978897 is an equidigital number, since it uses as much as digits as its factorization.

1837138978897 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1024192512, while the sum is 79.

The spelling of 1837138978897 in words is "one trillion, eight hundred thirty-seven billion, one hundred thirty-eight million, nine hundred seventy-eight thousand, eight hundred ninety-seven".