20125223549 has 2 divisors, whose sum is σ = 20125223550. Its totient is φ = 20125223548.

The previous prime is 20125223513. The next prime is 20125223561. The reversal of 20125223549 is 94532252102.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20102135524 + 23088025 = 141782^2 + 4805^2 .

It is a cyclic number.

It is not a de Polignac number, because 20125223549 - 2¹² = 20125219453 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20125223249) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10062611774 + 10062611775.

It is an arithmetic number, because the mean of its divisors is an integer number (10062611775).

Almost surely, 2^20125223549 is an apocalyptic number.

It is an amenable number.

20125223549 is a deficient number, since it is larger than the sum of its proper divisors (1).

20125223549 is an equidigital number, since it uses as much as digits as its factorization.

20125223549 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 43200, while the sum is 35.

The spelling of 20125223549 in words is "twenty billion, one hundred twenty-five million, two hundred twenty-three thousand, five hundred forty-nine".