168138400761277 has 2 divisors, whose sum is σ = 168138400761278. Its totient is φ = 168138400761276.

The previous prime is 168138400761217. The next prime is 168138400761377. The reversal of 168138400761277 is 772167004831861.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 126947407204836 + 41190993556441 = 11267094^2 + 6418021^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-168138400761277 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (168138400761217) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 84069200380638 + 84069200380639.

It is an arithmetic number, because the mean of its divisors is an integer number (84069200380639).

Almost surely, 2^{168138400761277} is an apocalyptic number.

It is an amenable number.

168138400761277 is a deficient number, since it is larger than the sum of its proper divisors (1).

168138400761277 is an equidigital number, since it uses as much as digits as its factorization.

168138400761277 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 18966528, while the sum is 61.

The spelling of 168138400761277 in words is "one hundred sixty-eight trillion, one hundred thirty-eight billion, four hundred million, seven hundred sixty-one thousand, two hundred seventy-seven".