127813387693 has 2 divisors, whose sum is σ = 127813387694. Its totient is φ = 127813387692.

The previous prime is 127813387643. The next prime is 127813387697. The reversal of 127813387693 is 396783318721.

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., 90247970569 + 37565417124 = 300413^2 + 193818^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-127813387693 is a prime.

It is a super-2 number, since 2×127813387693² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (127813387697) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 63906693846 + 63906693847.

It is an arithmetic number, because the mean of its divisors is an integer number (63906693847).

Almost surely, 2^127813387693 is an apocalyptic number.

It is an amenable number.

127813387693 is a deficient number, since it is larger than the sum of its proper divisors (1).

127813387693 is an equidigital number, since it uses as much as digits as its factorization.

127813387693 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9144576, while the sum is 58.

The spelling of 127813387693 in words is "one hundred twenty-seven billion, eight hundred thirteen million, three hundred eighty-seven thousand, six hundred ninety-three".