123877122661 has 2 divisors, whose sum is σ = 123877122662. Its totient is φ = 123877122660.

The previous prime is 123877122647. The next prime is 123877122671. The reversal of 123877122661 is 166221778321.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 123846982561 + 30140100 = 351919^2 + 5490^2 .

It is an emirp because it is prime and its reverse (166221778321) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 123877122661 - 2⁷ = 123877122533 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (123877122601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61938561330 + 61938561331.

It is an arithmetic number, because the mean of its divisors is an integer number (61938561331).

Almost surely, 2^123877122661 is an apocalyptic number.

It is an amenable number.

123877122661 is a deficient number, since it is larger than the sum of its proper divisors (1).

123877122661 is an equidigital number, since it uses as much as digits as its factorization.

123877122661 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 338688, while the sum is 46.

The spelling of 123877122661 in words is "one hundred twenty-three billion, eight hundred seventy-seven million, one hundred twenty-two thousand, six hundred sixty-one".