7868378387537 has 2 divisors, whose sum is σ = 7868378387538. Its totient is φ = 7868378387536.

The previous prime is 7868378387423. The next prime is 7868378387561. The reversal of 7868378387537 is 7357838738687.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6608812119121 + 1259566268416 = 2570761^2 + 1122304^2 .

It is a cyclic number.

It is not a de Polignac number, because 7868378387537 - 2¹⁰ = 7868378386513 is a prime.

It is a super-2 number, since 2×7868378387537² (a number of 27 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (7868378387587) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3934189193768 + 3934189193769.

It is an arithmetic number, because the mean of its divisors is an integer number (3934189193769).

Almost surely, 2^{7868378387537} is an apocalyptic number.

It is an amenable number.

7868378387537 is a deficient number, since it is larger than the sum of its proper divisors (1).

7868378387537 is an equidigital number, since it uses as much as digits as its factorization.

7868378387537 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7965941760, while the sum is 80.

The spelling of 7868378387537 in words is "seven trillion, eight hundred sixty-eight billion, three hundred seventy-eight million, three hundred eighty-seven thousand, five hundred thirty-seven".