20123144624749 has 2 divisors, whose sum is σ = 20123144624750. Its totient is φ = 20123144624748.

The previous prime is 20123144624741. The next prime is 20123144624783. The reversal of 20123144624749 is 94742644132102.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19240662870724 + 882481754025 = 4386418^2 + 939405^2 .

It is a cyclic number.

It is not a de Polignac number, because 20123144624749 - 2³ = 20123144624741 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20123144624741) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10061572312374 + 10061572312375.

It is an arithmetic number, because the mean of its divisors is an integer number (10061572312375).

Almost surely, 2^{20123144624749} is an apocalyptic number.

It is an amenable number.

20123144624749 is a deficient number, since it is larger than the sum of its proper divisors (1).

20123144624749 is an equidigital number, since it uses as much as digits as its factorization.

20123144624749 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2322432, while the sum is 49.

The spelling of 20123144624749 in words is "twenty trillion, one hundred twenty-three billion, one hundred forty-four million, six hundred twenty-four thousand, seven hundred forty-nine".