387178617789493 has 2 divisors, whose sum is σ = 387178617789494. Its totient is φ = 387178617789492.

The previous prime is 387178617789407. The next prime is 387178617789553. The reversal of 387178617789493 is 394987716871783.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 387153554783524 + 25063005969 = 19676218^2 + 158313^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-387178617789493 is a prime.

It is a super-2 number, since 2×387178617789493² (a number of 30 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (387178617783493) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 193589308894746 + 193589308894747.

It is an arithmetic number, because the mean of its divisors is an integer number (193589308894747).

Almost surely, 2^{387178617789493} is an apocalyptic number.

It is an amenable number.

387178617789493 is a deficient number, since it is larger than the sum of its proper divisors (1).

387178617789493 is an equidigital number, since it uses as much as digits as its factorization.

387178617789493 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 21508042752, while the sum is 88.

The spelling of 387178617789493 in words is "three hundred eighty-seven trillion, one hundred seventy-eight billion, six hundred seventeen million, seven hundred eighty-nine thousand, four hundred ninety-three".