136423424076781 has 2 divisors, whose sum is σ = 136423424076782. Its totient is φ = 136423424076780.

The previous prime is 136423424076707. The next prime is 136423424076839. The reversal of 136423424076781 is 187670424324631.

It is a happy number.

It is an a-pointer prime, because the next prime (136423424076839) can be obtained adding 136423424076781 to its sum of digits (58).

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 94925464420900 + 41497959655881 = 9742970^2 + 6441891^2 .

It is a cyclic number.

It is not a de Polignac number, because 136423424076781 - 2²³ = 136423415688173 is a prime.

It is a super-2 number, since 2×136423424076781² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (136423424074781) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 68211712038390 + 68211712038391.

It is an arithmetic number, because the mean of its divisors is an integer number (68211712038391).

Almost surely, 2^{136423424076781} is an apocalyptic number.

It is an amenable number.

136423424076781 is a deficient number, since it is larger than the sum of its proper divisors (1).

136423424076781 is an equidigital number, since it uses as much as digits as its factorization.

136423424076781 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 32514048, while the sum is 58.

The spelling of 136423424076781 in words is "one hundred thirty-six trillion, four hundred twenty-three billion, four hundred twenty-four million, seventy-six thousand, seven hundred eighty-one".