138481764833 has 2 divisors, whose sum is σ = 138481764834. Its totient is φ = 138481764832.

The previous prime is 138481764829. The next prime is 138481764857. The reversal of 138481764833 is 338467184831.

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., 136166904064 + 2314860769 = 369008^2 + 48113^2 .

It is a cyclic number.

It is not a de Polignac number, because 138481764833 - 2² = 138481764829 is a prime.

It is not a weakly prime, because it can be changed into another prime (138481764823) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 69240882416 + 69240882417.

It is an arithmetic number, because the mean of its divisors is an integer number (69240882417).

Almost surely, 2^138481764833 is an apocalyptic number.

It is an amenable number.

138481764833 is a deficient number, since it is larger than the sum of its proper divisors (1).

138481764833 is an equidigital number, since it uses as much as digits as its factorization.

138481764833 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9289728, while the sum is 56.

The spelling of 138481764833 in words is "one hundred thirty-eight billion, four hundred eighty-one million, seven hundred sixty-four thousand, eight hundred thirty-three".