123498736661 has 2 divisors, whose sum is σ = 123498736662. Its totient is φ = 123498736660.

The previous prime is 123498736651. The next prime is 123498736681. The reversal of 123498736661 is 166637894321.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 82415500561 + 41083236100 = 287081^2 + 202690^2 .

It is an emirp because it is prime and its reverse (166637894321) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-123498736661 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 123498736597 and 123498736606.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (123498736651) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61749368330 + 61749368331.

It is an arithmetic number, because the mean of its divisors is an integer number (61749368331).

Almost surely, 2^123498736661 is an apocalyptic number.

It is an amenable number.

123498736661 is a deficient number, since it is larger than the sum of its proper divisors (1).

123498736661 is an equidigital number, since it uses as much as digits as its factorization.

123498736661 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7838208, while the sum is 56.

The spelling of 123498736661 in words is "one hundred twenty-three billion, four hundred ninety-eight million, seven hundred thirty-six thousand, six hundred sixty-one".