138174769661 has 2 divisors, whose sum is σ = 138174769662. Its totient is φ = 138174769660.

The previous prime is 138174769631. The next prime is 138174769697. The reversal of 138174769661 is 166967471831.

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., 74914974436 + 63259795225 = 273706^2 + 251515^2 .

It is a cyclic number.

It is not a de Polignac number, because 138174769661 - 2⁶ = 138174769597 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 138174769661.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (138174769631) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69087384830 + 69087384831.

It is an arithmetic number, because the mean of its divisors is an integer number (69087384831).

Almost surely, 2^138174769661 is an apocalyptic number.

It is an amenable number.

138174769661 is a deficient number, since it is larger than the sum of its proper divisors (1).

138174769661 is an equidigital number, since it uses as much as digits as its factorization.

138174769661 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9144576, while the sum is 59.

The spelling of 138174769661 in words is "one hundred thirty-eight billion, one hundred seventy-four million, seven hundred sixty-nine thousand, six hundred sixty-one".