20613573749 has 2 divisors, whose sum is σ = 20613573750. Its totient is φ = 20613573748.

The previous prime is 20613573697. The next prime is 20613573763. The reversal of 20613573749 is 94737531602.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20102135524 + 511438225 = 141782^2 + 22615^2 .

It is a cyclic number.

It is not a de Polignac number, because 20613573749 - 2⁸ = 20613573493 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20613570749) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10306786874 + 10306786875.

It is an arithmetic number, because the mean of its divisors is an integer number (10306786875).

Almost surely, 2^20613573749 is an apocalyptic number.

It is an amenable number.

20613573749 is a deficient number, since it is larger than the sum of its proper divisors (1).

20613573749 is an equidigital number, since it uses as much as digits as its factorization.

20613573749 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 952560, while the sum is 47.

The spelling of 20613573749 in words is "twenty billion, six hundred thirteen million, five hundred seventy-three thousand, seven hundred forty-nine".