138065777 has 2 divisors, whose sum is σ = 138065778. Its totient is φ = 138065776.

The previous prime is 138065731. The next prime is 138065783. The reversal of 138065777 is 777560831.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 130051216 + 8014561 = 11404^2 + 2831^2 .

It is a cyclic number.

It is not a de Polignac number, because 138065777 - 2¹² = 138061681 is a prime.

It is a super-2 number, since 2×138065777² = 38124317557227458, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (138055777) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69032888 + 69032889.

It is an arithmetic number, because the mean of its divisors is an integer number (69032889).

Almost surely, 2^138065777 is an apocalyptic number.

It is an amenable number.

138065777 is a deficient number, since it is larger than the sum of its proper divisors (1).

138065777 is an equidigital number, since it uses as much as digits as its factorization.

138065777 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 246960, while the sum is 44.

The square root of 138065777 is about 11750.1394459811. The cubic root of 138065777 is about 516.8470166550.

The spelling of 138065777 in words is "one hundred thirty-eight million, sixty-five thousand, seven hundred seventy-seven".