20013061475249 has 2 divisors, whose sum is σ = 20013061475250. Its totient is φ = 20013061475248.

The previous prime is 20013061475131. The next prime is 20013061475311. The reversal of 20013061475249 is 94257416031002.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18022614543025 + 1990446932224 = 4245305^2 + 1410832^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20013061475249 is a prime.

It is a super-2 number, since 2×20013061475249² (a number of 27 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (20013061475749) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10006530737624 + 10006530737625.

It is an arithmetic number, because the mean of its divisors is an integer number (10006530737625).

Almost surely, 2^{20013061475249} is an apocalyptic number.

It is an amenable number.

20013061475249 is a deficient number, since it is larger than the sum of its proper divisors (1).

20013061475249 is an equidigital number, since it uses as much as digits as its factorization.

20013061475249 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 362880, while the sum is 44.

The spelling of 20013061475249 in words is "twenty trillion, thirteen billion, sixty-one million, four hundred seventy-five thousand, two hundred forty-nine".