20013653426749 has 2 divisors, whose sum is σ = 20013653426750. Its totient is φ = 20013653426748.

The previous prime is 20013653426731. The next prime is 20013653426843. The reversal of 20013653426749 is 94762435631002.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 16186798051524 + 3826855375225 = 4023282^2 + 1956235^2 .

It is a cyclic number.

It is not a de Polignac number, because 20013653426749 - 2¹¹ = 20013653424701 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20013653426696 and 20013653426705.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20013653426549) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10006826713374 + 10006826713375.

It is an arithmetic number, because the mean of its divisors is an integer number (10006826713375).

Almost surely, 2^{20013653426749} is an apocalyptic number.

It is an amenable number.

20013653426749 is a deficient number, since it is larger than the sum of its proper divisors (1).

20013653426749 is an equidigital number, since it uses as much as digits as its factorization.

20013653426749 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6531840, while the sum is 52.

The spelling of 20013653426749 in words is "twenty trillion, thirteen billion, six hundred fifty-three million, four hundred twenty-six thousand, seven hundred forty-nine".