20601488749 has 2 divisors, whose sum is σ = 20601488750. Its totient is φ = 20601488748.

The previous prime is 20601488737. The next prime is 20601488753. The reversal of 20601488749 is 94788410602.

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., 18236611849 + 2364876900 = 135043^2 + 48630^2 .

It is a cyclic number.

It is not a de Polignac number, because 20601488749 - 2⁵ = 20601488717 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20601488729) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10300744374 + 10300744375.

It is an arithmetic number, because the mean of its divisors is an integer number (10300744375).

Almost surely, 2^20601488749 is an apocalyptic number.

It is an amenable number.

20601488749 is a deficient number, since it is larger than the sum of its proper divisors (1).

20601488749 is an equidigital number, since it uses as much as digits as its factorization.

20601488749 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 774144, while the sum is 49.

The spelling of 20601488749 in words is "twenty billion, six hundred one million, four hundred eighty-eight thousand, seven hundred forty-nine".