123121049395777 has 2 divisors, whose sum is σ = 123121049395778. Its totient is φ = 123121049395776.

The previous prime is 123121049395739. The next prime is 123121049395781. The reversal of 123121049395777 is 777593940121321.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 117931259667456 + 5189789728321 = 10859616^2 + 2278111^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-123121049395777 is a prime.

It is not a weakly prime, because it can be changed into another prime (123121049395787) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61560524697888 + 61560524697889.

It is an arithmetic number, because the mean of its divisors is an integer number (61560524697889).

Almost surely, 2^{123121049395777} is an apocalyptic number.

It is an amenable number.

123121049395777 is a deficient number, since it is larger than the sum of its proper divisors (1).

123121049395777 is an equidigital number, since it uses as much as digits as its factorization.

123121049395777 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 20003760, while the sum is 61.

The spelling of 123121049395777 in words is "one hundred twenty-three trillion, one hundred twenty-one billion, forty-nine million, three hundred ninety-five thousand, seven hundred seventy-seven".