20117625640669 has 2 divisors, whose sum is σ = 20117625640670. Its totient is φ = 20117625640668.

The previous prime is 20117625640579. The next prime is 20117625640691. The reversal of 20117625640669 is 96604652671102.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18057510844569 + 2060114796100 = 4249413^2 + 1435310^2 .

It is a cyclic number.

It is not a de Polignac number, because 20117625640669 - 2¹³ = 20117625632477 is a prime.

It is a super-2 number, since 2×20117625640669² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20117625640169) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10058812820334 + 10058812820335.

It is an arithmetic number, because the mean of its divisors is an integer number (10058812820335).

Almost surely, 2^{20117625640669} is an apocalyptic number.

It is an amenable number.

20117625640669 is a deficient number, since it is larger than the sum of its proper divisors (1).

20117625640669 is an equidigital number, since it uses as much as digits as its factorization.

20117625640669 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6531840, while the sum is 55.

The spelling of 20117625640669 in words is "twenty trillion, one hundred seventeen billion, six hundred twenty-five million, six hundred forty thousand, six hundred sixty-nine".