123396681673 has 2 divisors, whose sum is σ = 123396681674. Its totient is φ = 123396681672.

The previous prime is 123396681671. The next prime is 123396681731. The reversal of 123396681673 is 376186693321.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 117081677584 + 6315004089 = 342172^2 + 79467^2 .

It is an emirp because it is prime and its reverse (376186693321) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 123396681673 - 2¹ = 123396681671 is a prime.

Together with 123396681671, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (123396681671) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61698340836 + 61698340837.

It is an arithmetic number, because the mean of its divisors is an integer number (61698340837).

Almost surely, 2^123396681673 is an apocalyptic number.

It is an amenable number.

123396681673 is a deficient number, since it is larger than the sum of its proper divisors (1).

123396681673 is an equidigital number, since it uses as much as digits as its factorization.

123396681673 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5878656, while the sum is 55.

The spelling of 123396681673 in words is "one hundred twenty-three billion, three hundred ninety-six million, six hundred eighty-one thousand, six hundred seventy-three".