20425138237477 has 2 divisors, whose sum is σ = 20425138237478. Its totient is φ = 20425138237476.

The previous prime is 20425138237459. The next prime is 20425138237499. The reversal of 20425138237477 is 77473283152402.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20062928055556 + 362210181921 = 4479166^2 + 601839^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20425138237477 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20425138237447) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10212569118738 + 10212569118739.

It is an arithmetic number, because the mean of its divisors is an integer number (10212569118739).

Almost surely, 2^{20425138237477} is an apocalyptic number.

It is an amenable number.

20425138237477 is a deficient number, since it is larger than the sum of its proper divisors (1).

20425138237477 is an equidigital number, since it uses as much as digits as its factorization.

20425138237477 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15805440, while the sum is 55.

The spelling of 20425138237477 in words is "twenty trillion, four hundred twenty-five billion, one hundred thirty-eight million, two hundred thirty-seven thousand, four hundred seventy-seven".